moved PCGameStateInLevelMenu check to update and deleted didMoveToView.
added support for timers on each level. each level now supports a time limit with lose condition.
added "Try Again" label on lose condition to allow user to replay current level.
added NSCoding support to AnimatingSprite.
added NSCoding support to TileMapLayer.
added NSCoder support to TmxTileMapLayer.
added NSCoder support to Breakable.
Added basic NSCoder support to MyScene.