load swf as BitmapMovieClip

BitmapMCManager: getBitmapMC -> new a BitmapMovieClip with Vector.<BitmapFrameInfo> as null then ResManager loadRes -> 將swf用urlLoader將所得data以byteArray形式 load出來，byteArray完成後呼叫該resource(byteArray)的complete callback，也就是BitmapMCManager.loadComplete: 將load出來的swf進行cacheAsBitmapMC且updateBitmapMovieClip將res url對應到load出來的BitmapMovieClip。cacheAsBitmapMC(將load好的resource當成MovieClip後將此MovieClip轉成BitmapMovieClip): call BitmapCacher.cacheBitmapMovie