Conmsidering how hard it is in Duke Nukem based games to modify the level music, there is now a setting for this in mussetting.txt to make the job easier and even allow setting level music in Redneck Rampage without replacing game data.
- consolidated the 3 identical S_OpenAudio implementations. The replacement code is disabled for the time being because it needs a rewrite. The replacement logic is uses is a bit too volatile.
- removed the old GRP scan code.
This is a lot of changes in a lot of code because nothing here was abstracted into the sound system. :(
Hopefully most of the affected code here can be tossed out soon, it's not pretty.
- Added names for system RX/TX channels
- Detect if map requires new features to work properly via special TX and command
- Effect Gen update
# Conflicts:
# source/blood/src/actor.cpp
# source/blood/src/eventq.h
# source/blood/src/triggers.cpp
# source/blood/src/triggers.h
