player client: you can now pass the nextCheckpointPosition into the onUpdateCheckpointDirection method.
android: ControlThread takes care of the SoundPlayer2D.
- it creates and adds a listener to get the next checkpoint position.
- starts and stops the sound player.
Merge branch 'master' into android-sound
Merge branch 'master' into android-sound
Merge remote-tracking branch 'origin/master' into android-sound
Merge pull request #10 from lumannnn/android-sound

Android sound