Custom Remapable (&Unlit) Ranges

[milajanesutherland]

The remapable area of palettes is, as far as I know, hardcoded to a specific range.
The same goes for the so-called Unlit colors for shp-based things (voxels can edit vpl)

Implementing something to give the ability to change these ranges/indices easily would be pretty nifty, better yet, if it could be made per-art.ini entry and not just global.

[ART]
Remapable=yes
Remapable.StartIndex=16
Remapable.Length=16
Remapable.Indices=16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31

Either as a start/stop range or maybe individual indices(think how OpenRA handles remap).
If some of these tags would not be specified, it would just use the vanilla values.