Rewrite MIDI capital tone fallback (CTF) emulation

[ceski-1]

We had this in Woof for a long time, but it's worth making it better with the big cross-platform MIDI update and the release of Nuked SC-55. Lots of info about this feature: dosbox-staging/dosbox-staging#2390 Check out the game list and remember that a lot of Doom wads use MIDI rips from other games.

Capital tone fallback (CTF) changes for Woof:

• More accurate to original SC-55 (1.21). Some minor intentional differences to avoid silence.
• Enabled by default and is not disabled unless the user edits their config. Reasoning:
  • CTF provides better compatibility for most Roland-like devices, including MS GS Synth and Nuked SC-55 with mkII roms.
  • Works transparently with Yamaha devices (e.g. S-YXG50) at default midi_* settings.
  • Even in GM mode, some songs pick bad drum sets. A good example is dbp37_test.wad which shows "No DRUM SET" with an SC-55 mkII or Nuked SC-55. These errors are fixed with CTF.
  • Power users can disable it for edge cases. Maybe there's a rare song that uses advanced SC-88 or XG features that sounds nice with the right hardware, but those MIDI features wouldn't be heard anyway with FluidSynth, SC-55, MS GS Synth, etc.

[rfomin]

Looks perfect, thanks!