Merge pull request #103 from calfjohn/master

2 commits
Add hp drop effects
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D

Conflicts:
	src/BattleScene.lua
	src/actors/Actor.lua
	src/actors/Knight.lua
Refactor audio in hurt
Merge pull request #104 from RaoZiJian/master

	Add hp drop effects
modify camera position
add arrow for archer