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

Add: {CURRENCY_SHORT} only did k / m suffix. Add bn / tn and make translatable. (#11921)

64bit numbers are REALLY large, but our compact method was build
for 32bit numbers. Extend it to 64bit.

Fix: Memory leak in ICUParagraphLayout::NextLine() (#11895)

This function calls icu::BreakIterator::createLineInstance() but does not clean up after it.

Instead use a static instance that is cloned (for thread-safety) and deleted as necessary.

Change: Don't handle 'missing' string parameters as 0. (#11673)

If not enough parameters are supplied for a string, then a value of 0 was used, which could result in incorrect information being displayed.

Instead, throw an exception and include an error in the string.

Codechange: No longer advance parent offset in StringParameters parent mode

Add method to manually advance offset

Codechange: Use MakeParameters with GetNextParameter in FormatString (#11583)

Instead of StringParameters subspan, to avoid GSs being able to
cause subspan boundary assertion failures

Codechange: Replace AllocatedStringParameters with ArrayStringParameters (#11452)

All uses of AllocatedStringParameters are with a compile-time fixed
constant.
Use of a dynamically allocated buffer on the heap is unnecessary and
increases overhead, particularly due to frequent use as a temporary.

Cleanup: Remove some unused functions. (#11429)

These were picked up with cppcheck.

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

Remove: obsolete NewGRF text unprinting. (#10884)

Co-authored-by: Rubidium <rubidium@openttd.org>

Codechange: Use IsValidCargoID/IsValidCargoType.

IsValidCargoType() is used only for unmapped IDs.

Change: Units-system can convert from N to kN, don't preconvert.

This allows force to passed as is and avoid premature rounding.

The AI function "GetMaxTractiveEffort" still needs to return kN to avoid breaking the API.

Change: Standardise unit conversions and allow decimal places.

Previously the decimal_places member was mostly ignored except for
specific conversions. {DECIMAL} with 0 is the same as {COMMA} so there
is no downside to allowing any conversion to have decimals.

Change: Perform unit convert with a double-precision constant.

Unit conversion is only performed for display purposes, this does not
affect lock-step mechanics.

This replaces the old multiply and shift algorithm which relies on
choosing a multipler and shift combination that gets close. Some of these
multiply/shift combinations were quite inaccurate. We can just
use (close-to) real-world numbers instead.

Feature: drop ICU-lx in favour of directly interfacing with harfbuzz

This means we have RTL support again with ICU 58+. It makes use of:
- ICU for bidi-itemization
- ICU for script-itemization
- OpenTTD for style-itemization
- harfbuzz for shaping

Codechange: Use cached name for all station/industry/town name formatting. (#10634)

This reuses an existing name caching mechanism to avoid "recalculating" names every time.

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.

Change: Rename some freetype things to fontcache.

The font cache supports more than just FreeType as a font provider, but still used freetype in some naming.

This now uses more suitable terms.

Fix: don't complain when the sprite font is missing glyphs. (#9692)

Silently auto-pick a suitable font.

Codechange: use the C++ std::getenv over the POSIX/C getenv

The C++ std::getenv is guaranteed thread-safe by the C++11 specification,
whereas the POSIX/C getenv might not be thread-safe by the C11 specification.