Update to most current engine

Conflicts:
	src/characters/red.cc
	src/characters/yellow.cc
	src/characters/yellow.h
	src/engine/action.cc
	src/engine/action.h
	src/engine/character.cc
	src/engine/character.h
	src/engine/hitstun.cc
	src/engine/interface.cc
	src/engine/player.cc
	src/engine/projectile.cc
	src/engine/utility.cc
Uh

Conflicts:
	src/SConscript