* Adding BL_Action::Play() and BL_Action::Stop()
* Making BL_ActonManger reuse BL_Actions instead of recreating them all the time
* Making the Property play type work for the Action actuator.
BL_ActionManager:
* IsActionDone(short layer) - Checks to see if the animation on the given layer has finished.
KX_GameObject:
* PlayAction(...) - Adds an action to the object's action manager
* StopAction(short layer) - Remove an action from the object's action manager
* IsActionDone(short layer) - Check if an action has finished playing
