13 years later, ST-NICCC demo is improved :)

Main change:
- The music is no more STE specific. STF owners have music now! It use HexTracker replay routine by Paulo Simoes on STF, and still use Lance player for STE.

Minor changes:
- STE module replay fix (end of the music)
- Polygon filler optimized a bit (on STe)
- 3d dots intro part minor graphic bug fixed
- Added a nice OXYGENE logo before credits part

Hint: On STE hardware, press F10 during boot to force the STF version if you want.