grafx - Extensible Java Graphics Package Code

Fixing a slight oversight. I forgot to check that the length of audio track
AUDIO_COMPOSITE_TRACK_INTERMEDIATE is greater than AUDIO_INCR_MILLIS before
chopping that much time off of it. This was leading to errors.

Adding a sample video which demonstrates the game very well.

Doing a proofread and making small corrections, scripts/generate-audio-track.sh
(still untested).

Optimizing generate-audio-track.sh, still untested.

Adding convert-to-png2x.sh.

Adding sample game game.blo. It has many interesting elements.

Placing the frame in the middle of the screen.

Forcing a delay at level start, both in real-time play mode and in playback.

Adding buzzer.au.

Playing buzzer.au during playback, when AddedLayersEvent is going to happen
soon.