[Ohrrpgce] SVN: teeemcee/8393 Cleanup up sound effects code in the backends

[subversion at HamsterRepublic.com]

teeemcee
2017-02-17 01:33:49 -0800 (Fri, 17 Feb 2017)
291
Cleanup up sound effects code in the backends

Renamed LoadSound/UnloadSound to load/unload_sound to match the rest of
the interface, use bools, change terrible variable names, remove unused
variables, etc. This code was a real mess. There is still way too much
duplication between backends.
---
U   wip/browse.bas
U   wip/music.bi
U   wip/music_allegro.bas
U   wip/music_audiere.bas
U   wip/music_native.bas
U   wip/music_native2.bas
U   wip/music_sdl.bas
U   wip/music_silence.bas