droid: add helper function for grabbing the target file from an intent
droid: play the file from the launch intent (if any)
droid: register native functions at startup
droid: add onNewIntent for receiving files to play
droid: subclass CJNIBroadcastReceiver for onReceive
droid: register/unregister our receiver in pause/resume as per Android docs
droid: hook up _onNewIntent