Fix AY PSG clock divider function when exists, Update emulation core (MAME AY PSG and compatibles - includes noise routine updates)
Fix configuration flag, Add MSX Darky sound expander to preset
Clock divider isn't affected to expanded mode's tone and noise generator?
so, there's to way for reduce N163 noises: reduce channel limit and demultiplex
* channel limit is runtime changeable and it makes some usable effects with disable demultiplex
* demultiplex is used for "non-ear destroyable" emulators, but less hardware accurate. (when LPF and RF filter is not considered)
Furnace support both after this, You can choose output behavior via configuration flag.
2 Pulse channels:
- 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume.
- Furnace support PCM playback in pulse channels with duty cycle ignore mode.
Sawtooth:
- nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic).
VRC6 instrument:
- 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels.
Duty, PCM mode command and Duty macro affects for pulse channel only.
