PaletteManager: Add ability to reorder colors #39
Description
Add ability to reorder palette colors.
Add to PaletteManager as well as popup palette in PortraitManager and BattleSpriteManager.
NOTE: Consider that these reordering options might be necessary:
- Reordering colors affects image colors: Simply changing the color of each palette index
- Reordering colors does not affect image: As above but image pixel color indexes will need to be updates to new indexes