Platformer

描述：

  包含2D平台游戏的模块。

签名：

local Platformer = {
	Behavior = Behavior,
	Decision = Decision,
	Data = Data,
	PlatformCamera = PlatformCamera,
	PlatformWorld = PlatformWorld,
	TargetAllow = TargetAllow,
	UnitAction = UnitAction,
	Unit = Unit,
	BulletDef = BulletDef,
	Bullet = Bullet,
	Face = Face,
	Visual = Visual
}