moved actor to its own folder
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D
hacked engine so 2d stuff reads depth only
updated AI
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D

Conflicts:
	src/BattleScene.lua
	src/GameMaster.lua
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D

Conflicts:
	src/BattleScene.lua
	src/actors/Knight.lua
Merge pull request #87 from Wu-Hao/master

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