Many improvements

Overall:
* reduced static array initialization usage to reduce binary size for
Emscripten
Monitor improvements:
* debuggable drive
* dump raster counters for C64 as well
Video:
* vsync option added
* hue offset option added
* CRT gamma correction added
Audio:
* better timing during frequent updates
C64:
* replaced palette with measured hues
* sprite emulation fixes
* improved serial IEC port emulation accuracy
15 files changed