implement support for TIMB chunk inside XMIDI-parser (forwarding of data to driver)
implement actual support for TIMB chunk inside Miles Audio MT32 driver
MI2 deletes the parser object(!) so we can't access any member
variables here. Thanks to athrxx for finding this.
This reverts commit 86c2fe47e04449602e4c005fa0a9c183bc8bba39 and adds
a comment explaining why.
The actual MidiDriver derives from it. MidiDriver_BASE only
provides the minimal API necessary for transmitting MIDI data.
The idea is that this is all MidiParser needs, thus allowing
us to simplify the various MidiPlayer classes in our engines.