Fixes:
* Nuclear-purple color exploit.
* #3247.
* Removes a bunch of unnecessary color conversions every frame.
Caveats:
* The ramp range is now defined on the palette, so ramps can no longer be set per-player (may impact maps which define custom colors).
* It's no longer possible to perfectly recreate the original WW color ramps (I doubt we care).
* The old ColorRamp setting isn't migrated, so players will lose their color settings.
The unit will now path to the nearest adjacent cell, drag inside, do the inner activity, then (if still alive) drag back to its original
location.
This fixes:
- Mismatch in logic between Enter and MoveAdjacentTo,
which causes an infinite loop.
- Building capturing failing from certain directions.
- Being unable to enter buildings on unpathable tiles.
- Units being stranded inside a building if the requirements
for the inner order aren't met.
