Change: Use bitmap for free unit ID generation. (#12165)

This improves performance of finding the next free unit number for a vehicle.

Based loosely on pool's used slot bitmap.

Change: Decouple and remove landscape-dependent cargo types. (#11719)

Cargo types of default engines, industries and houses are now specified in terms of label.

Codechange: Split CT_INVALID into CT_INVALID and INVALID_CARGO.

INVALID_CARGO is a CargoID and should be used for most purposes in game.
CT_INVALID is a CargoType used for defining default properties.

Fix #10926: New free wagons no longer split by type. (#11507)

NormalizeTrainVehInDepot() should only be called if an engine was built, not for wagons.

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 #10502: Refit engine before attaching free wagons. (#10926)

Caused by incorrect order of operations when buying a train engine with refit and attaching free wagons.

Codechange: Base CargoArray off std::array.

This avoids needing to define array accessors and allows use of
default value initialization.

Codechange: Use IsValidCargoID/IsValidCargoType.

IsValidCargoType() is used only for unmapped IDs.

Codechange: add non-nullptr asserts in cases where it should never be nullptr

Though where similar calls are checked for nullptr as in those instances of
the use of that function it can actually return nullptr. In other words, write
down the assumption that the function never returns nullptr in an assert.

Fix #10032: Capacities of articulated vehicles in build window

See also: #9954

Fix: depot-related commands did not validate depot tiles properly (#9948)

The bug comes in two slices:

1) the functions never actually checked if "tile" was a depot tile.
This allowed executing the function on tile 0, where are the
things like shadows of aircrafts are.
2) BuildDepotVehicleList() first checked if a vehicle is in a depot
before checking if it was a primary vehicle. This is invalid
for aircraft.

Fixing the first hides the second, and fixing the second makes the
first non-exploitable. But, fixing both felt like the best thing
to do.

Codechange: Template DoCommand to automagically reflect the parameters of the command proc.

When finished, this will allow each command handler to take individually
different parameters, obliviating the need for bit-packing.

Codechange: Let the compile generate the master command table out of templated command traits.

This is using a non-intrusive type-traits like templated system, which
allows compile-time validation that the command table and the command
enum match up.

Fix 02e770ff: allow estimating CloneVehicle if short on money (#8748)

CheckCompanyHasMoney() was also executed when not using DC_EXEC,
resulting in an error about shortage of money instead of the
estimation.
This mostly is a problem for AI players, as they will have no
way to know how much it would have cost.

Fix: don't allow cloning vehicles if cloning orders is failing (#8515)

Before this fix, any failing clone order was silently ignored
and you as user would never know till you checked the order list.
Evil.

Fix #8093: Build+Refit changed game-state in command test run, and thus caused desyncs.
Use DC_AUTOREPLACE for actions that shall be reversibe, in this case:
- Do not rearrange free wagons in test-run.
- Do not discard OrderBackups.
The latter was not triggered by actual auto-replace, since it does not set a 'user'.

Fix #6676: Prevent helicopters from stopping in midair during some kinds of landing

This adds a new flag that gets stored in the savegame, but it should still be compatible both ways, hence no save version bump.