Some m6569.h (VIC-II) optimizations and improvements. #107
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(fixes visual artifacts in Dawnfall demo)
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Slightly better performance especially when no sprites are displayed.
Some very minor correctness fixes, mainly moving some actions to their correct cycle positions, and a bug fix involving the raster unit vc (video counter). Alltogether this fixes some visual artifacts in the Oxyron/Dawnfall demo:
Before:
After:
Note though that the more fundamental issues described here are NOT yet fixed:
#99