Enabled palettes for items/enemeis, updated templates

Now items like the extra life, e-tank, etc. can use the same colors as
Rock. Enemies can also use palettes.
Refactored some of the palette code to support loading
Implemented palette loading from JSON
Merge branch 'master' of https://github.com/zackthehuman/hikari

Conflicts:
	engine/src/hikari/client/game/objects/PalettedAnimatedSprite.cpp