This was solely meant for the original WildMidi player but got seriously in the way of how this code gets used by GZDoom. In GZDoom the player object is owned by the MIDI devive which should be the only instance which is allowed to destroy it.
- allow the GUS to change sound fonts at run time.
- implemented sound font manager support in the GUS synth. This works but also made me realize that the SF2 support of this synth has been rather broken, apparently forever.
- added the missing handler for reading Timidity configs from the lump directory.
- fixed incomplete init of the GUS synth when no soundfont can be located.
- fixed bad initialization of WildMidi sampling frequency. It would default to 11.025 kHz if no valid rate was set. Now it will use the sound device's native frequency.