Simulate DPMI memory management.
Add ASS assembler replacement stubs.
Add ASS native driver stubs.
Bind the ASS native driver to SDL2.
Also includes an attempt to replace interrupts with thread based
locking.
Add assembler replacement for 8 bit mono mixing.
Make assembler definitions inline.
This prevents conflicts between threads when accessing global state.
Improve audio callback handling.
The result should be much more correct now.
Fix panning table type ambiguity.
Implement more audio functions.
Activate sound effects.
Add MIDI playback infrastructure via PortMidi.
Rework timer infrastructure.
Timing is now based on explicit SDL timers instead of threads.
Expose current tick count.
Add timestamps to MIDI events.
Activate MIDI music.
Implement music fading.
Actually render various transitions.
Make native audio the default.
Update README.