grafx - Extensible Java Graphics Package Code

In ModernAudioClip, changing the default unpaused state to be 0 instead of -1.
Finally, adding some insightful comments to _ensureState(). I think this audio
system is now nearing completion. I don't see how we can improve it any more.

Changing the STOP value of m_startedMillis from -1 to 0.

Improving comments & Javadoc in ModernAudioClip.

Adding a TODO comment to .generate-audio-track.sh.

Implementing TRIES = 3 in ModernAudioClip.

In _ensureState() refining the waiting strategy. These multi-threaded issues
are always very challenging to solve.

Trying to condense code in ModernAudioClip a little bit by defining and making
use of _clip_start() & _clip_loop().

In ModernAudioClip, adding a couple of comments and replacing an idential piece
of code with _internalStop().

Reporting errors during "instantiation" in ModernAudioClip. Before, errors
were silently ignored.

Fixing issues with the 'pause Schuld'.