Codechange: Remove direct access to _colour_gradient.

Access is now through GetColourGradient, which ensures parameters are in range.

Revert #11993: new number format system does not and cannot work for CJK languages

There are too many intricacies that I am unaware of that are popping up after
asking whether things are right or not.
I do not want to keep playing whack-a-mole, so just revert the whole thing.

This reverts:
15be383b934dbf7c876b6d6ffaec7a406c82a39f
360fe8b0b639be9d39bc03a9d5d34123204c14fa
1aa9a5c0abaf9c5d6c49a3a76e2b1d7134c0bd10
59f56941e50bd4ebad31f9e771a4441f647692e5
7e2eefb91ff5999667752eea6e13bd8a0d293f48
b741b2ba6f790891961cb66a9320e75ca168cee4
609d0071d5e6b93aa61688714e9b92cf102e4683
9f8fd80112c188675179c9568a9be84da3df1713
a253205b932cc50fc9f25be390a6aaa370f89a45
819c6c756edd68599571eae126f305d6e3d247fc

Fix: TextfileWindow called virtual methods before constructor completed. (#11889)

SetStringParameters() was called during widget tree init in the constructor.

Calls within a constructor cannot call the derived classes methods. This would result in invalid data being passed to the string system, which could then crash.

Codechange: Make all NWidgetPart arrays constexpr.

This ensures that the arrays are not created at runtime and prevents using non-constexpr values.

Fix e1f5be62: Clear font cache when toggling sprite font. (#11780)

This is necessary for the sprite font height and ascender to be updated correctly.

Codechange: Replace mishmash of types for widget index with WidgetID.

Indices were stored as int, but often passed around as uint/uint8_t and casts.

Now they should all use WidgetID.

Codechange: Don't keep autosave_interval in std::chrono::minutes.

This variable is saved as a setting which requires the variable type to be known, but std::chrono::minutes may vary depending on system type.

Instead, keep as uint32_t and convert to std::chrono::minutes only when setting the timer.

Add: Website button to Game Options window for basesets.

This links to the optional "url" item in the baseset's [metadata] section.

Change: Use CRTP-mixins to compose dropdown list items.

This allows list items to built from component parts as required, and additional
functionality is added:

* Icons and text can be positioned at the start or end of the space (templated.)
* Font size of text can be changed (templated.)
* Palette of sprites can be set (runtime.)

Codechange: Remove FONT_HEIGHT_... macros. (#11481)

These make it look like we're dealing with a constant, but actually each is a call to `GetCharacterHeight(...)`.

Codechange: Simplify setting minimum width for game options dropdown lists. (#11474)

Height isn't necessary as drop down controls already have sufficient height, so we can use GetDropDownListDimension() to get the width.

Change: Move baseset missing/corrupted files label to list item. (#11455)

This allows any baseset error to be displayed in the drop down list so it is more easily visible, and avoids wasted space in the layout.

Codechange: Add __FILE__/__LINE__ of WindowDesc to WindowDesc.

This is to allow unit-tests to produce more useful output.

Codechange: Remove unused parameter for Height()

DropDownListItem::Height does not need to take an argument so remove it

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Codechange: Avoid emplace_back(new()) into a unique_ptr. (#11384)

This could theoretically leave an unmanaged pointer in certain circumstances, and directly using
make_unique shows intent.

Add: data parameter in Window::Close method.

This allows passing data when closing a window, e.g. to indicate how it was closed.

Codechange: Use begin/end of nwidget parts of begin/length.

This simplifies processing nwidget parts as, unlike the remaining length, the pointer to the end of the list never changes. This is the same principle as we use(d) for tracking end instead of length for C-style strings.

And this removes 160~ instances of the lengthof() macro.

Feature: Add config option to set default company secondary colour for new games

This does duplicate translation strings for the colours

Codechange: automatic adding of _t to (u)int types, and WChar to char32_t

for i in `find src -type f|grep -v 3rdparty/fmt|grep -v 3rdparty/catch2|grep -v 3rdparty/opengl|grep -v stdafx.h`; do sed 's/uint16& /uint16 \&/g;s/int8\([ >*),;[]\)/int8_t\1/g;s/int16\([ >*),;[]\)/int16_t\1/g;s/int32\([ >*),;[]\)/int32_t\1/g;s/int64\([ >*),;[]\)/int64_t\1/g;s/ uint32(/ uint32_t(/g;s/_uint8_t/_uint8/;s/Uint8_t/Uint8/;s/ft_int64_t/ft_int64/g;s/uint64$/uint64_t/;s/WChar/char32_t/g;s/char32_t char32_t/char32_t WChar/' -i $i; done

Fix #11054: Prevent translation of currency codes.

Most languages stick with the 3-letter latin currency codes in the name
string, however some translations are... clever... and use the currency
symbol instead. Whilst this may look nice, it can cause issues with fonts
as some scripts have a specific limited set of fonts which do not include
these symbols.

Instead, hard code the currency code list and add it when drawing the
currency name.

Codechange: Make DropDownListStringItem preformat and remove other implementations. (#11063)

Having to choose between DropDownListStringItem, DropDownListCharStringItem, and DropDownListParamStringItem depending on whether to draw a StringID, a raw string, or a StringID with extra parameters was needlessly complex.

Instead, allow passing a StringID or raw string to DropDownListStringItem. This will preformat the StringID into a raw string, and can therefore accept parameters via the normal SetDParam mechanism.

This also means that strings no longer need to be formatted on every draw.

Codechange: Use window parent association for dropdowns.

This replaces the separate window class and number properties, and
allows the window system to close dropdowns automatically.

Feature: opt-in survey when exiting a game

On first start-up, the game will ask if you want to participate
in our automated survey. You have to opt-in, and can easily opt-out
(via the Options) at any time.

When opt-in, whenever you exit a game, a JSON blob will be send
to the survey server hosted by OpenTTD. This JSON blob contains
information that gives a global picture of the game just played:
- What settings were used
- How many humans vs AIs
- How long the game has been played
- Basic information about the OS / CPU

All this information is kept very generic, so there is no
chance we send private information to our survey server.
Nothing in the JSON blob could identify you as a person; it
mostly tells about the game played. At any time you can see
what the JSON blob includes, by pressing the "Preview Survey
Results" button in-game.

Cleanup: widget pos_x/y are already int. (#10809)

Remove old casts left over from when pos_x/y were unsigned.

Change: include fmt.h C++ headers in stdafx.h

This to prevent compilation issues between runs with and without precompiled
headers. Also remove the headers from the rest of the code base as they are
not needed there anymore, although they do relatively little harm.

Change: base autosaves intervals on real time (instead of game time) (#10655)

There are two fundamental issues with autosave:
- When fast-forwarding, it saves way too often
- When paused, it never saves

Both makes no sense. Autosaves are meant to prevent you from
accidentally losing your work. The emphasis on "your" work.

To solve both issues, the autosave now works on real time. You
can select every 10 / 30 / 60 / 120 minutes, which are similar to
what the setting was in game-months.

When you pause, autosaving will stop. Unless you make any change
to the game; then it will continue to make autosaves, even so
the game is paused. Unpausing / pausing resets this mechanism.

Change: Draw and size video driver info like base set info.

This allows very long video driver information strings to wrap instead
of making the game options window very wide.

Change: Size Game Options description widgets after initial sizing.

Trying to update text widgets with free flowing multiline text during
UpdateWidgetSize(), as the final width is not yet known and so the
calculated height being incorrect, usually resulting in one or more
empty text lines.

The solution is to update the widget heights afterwards during
OnResize(), at which point the final widths are known. The window is
then resized if needed.

(Note this technique needs more attention if width can also change.)

Change: Make all dropdown lists extend width if necessary.

This removes the auto_width parameter from ShowDropDown(At).

Feature: Separate rail/road and sea/air velocity units, and add knots. (#10594)

This is achieved by packing vehicle type along with the velocity so that
the string system can decode and pick the appropriate unit.

Codechange: Reorder and properly declare DrawSpriteIgnorePadding().

Parameters have been rearranged to be closer to those of the standard
DrawSprite() function, and PaletteID can now be set.

Feature: Variable GUI scale.

GUI scale is now variable from 100% to 500%, and no longer restricted to
powers-of-2.