These were broken by the last PR merge which included a cpp file in a
way which will not build reliably. This splits the Accolade MIDI driver
structure definitions into headers allowing these to be included
instead.
Also, minor cleanup by removal of unused header includes.
- renamed _MT32 to _nativeMT32
this name doesn't really make sense, because MUNT isn't a native
MT32, but the name is common to the other engines
- implement MT32 -> General MIDI mapping in case no MT32 is
available
- implement dialog screen, so that user is told about General MIDI
mapping and that it may sound awful
- Kirben told me that Elvira 2 is shipped with MUSIC.DRV and
INSTR.DAT file. Using MUSIC.DRV file makes the music work properly
I couldn't check, b/c I own none of these games.
- also commented out implemented bug of INSTR.DAT/MUSIC.DRV
This bug only affected the adlib drivers, so I guess we should
rather fix it instead of implementing the same buggy behavior
- both known variants are supported (INSTR.DAT + MUSIC.DRV)
- INSTR.DAT/MUSIC.DRV holds channel mapping, instrument mapping, etc.
- fixed bug inside S1D MidiParser, that ruined some instrument changes
0xFC header was seen as 2 byte header, but it's 4 bytes in Elvira 2
and 5 bytes in Waxworks / Simon 1 demo
- dynamic channel allocation for the MUSIC.DRV adlib driver is not
implemented atm, simply because at least the demos of Waxworks and
Simon 1 do not use this feature
- sound effects of Waxworks are not implemented atm
- note: the game "Altered Destiny" uses Accolade INSTR.DAT variant too
