game_engine. Minor code cleanup.

Remove cluttering logs from java code - keep the loggin concise.
Override game activity on destroy - only for logging purposes for now.
Add some todo comments.
game_engine. Pass device rotation data to the native engine.

Add on rotate method to java game engine.
Add JNI on rotate method to java game engine.
Change device rotation handler to call the game engine on rotate when handling vector rotation sensor events.