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
Fixing merge conflict like a boss
Fixed Rock behavior bugs when round starts

Fixes #121 and #122. Rock now starts facing right and his weapon is
reset to the Mega Buster.
Merge pull request #124 from zackthehuman/master

Shared / item palettes and other bug fixes