Added some GFABASIC stuff and a utility for setting the audio volume on the Falcon 030.
The GFA stuff includes:
* STE VBL handler for the VBL queue - to feed the STE shifter with hardware scrolling settings
* FPATCH2 for GFA - inlined version of FPATCH2.PRG to autorun its functionaliyt from your code (in case user forgot to load FPATCH2.PRG)
Have fun - and Happy Easter