audio. Fix to SLES source construcotr.

User iterator to iterate over buffers when testing all buffers have the same format.
game_engine. Change create native JNI call to get path to game tree.

Change create native call to get a string that holds game tree path.
Change java game interface and game engine to get the path to the game tree from the game bundle.
Change test game to pass the test game tree in the game bundle when creatig the engine.