opal-zig v2.0.2-1

Changed

• Binds opal 2.0.2. NEW (register 105h bit 0) is a live mode bit: bank 1, waveforms
  4-7, CHA and CHB, and four-operator pairing apply only while it is set. Disabling
  4-op no longer clears pair_index. That field is the physical partner, or ch_none
  for channels that cannot pair. chan_type says whether 4-op is active. init now
  sets every operator's eg_out to 0x1FF, so a snapshot taken before the first sample
  is silent. A masked timer overflow now sets FT1 or FT2. IRQ (bit 7) is set only when
  that timer is unmasked.

Added

• version_major, version_minor, version_patch, and the packed version
  (major * 10000 + minor * 100 + patch), matching the OPAL_VERSION_* macros in
  opal.h.
• Tests for the 2.0.2 core fixes: pair-index wiring, NEW as a live mode bit, silence
  after enabling OPL3 without writing C0, stored waveforms 4-7 while NEW is clear,
  and a masked timer overflow that must still raise FT1.

Fixed

• The pair_index field comment said it was ch_none when 4-op was off. Init
  pre-wires the physical partners, so a visualizer that treated a nonzero pair_index
  as "4-op is on" would misread every capable channel after init.