Since this gets used by both the sound backend and the music code it needs to be in a place accessible to both.
# Conflicts:
# src/CMakeLists.txt
# Conflicts:
# libraries/zmusic/decoder/mpg123_decoder.cpp
# libraries/zmusic/decoder/sndfile_decoder.cpp
# src/CMakeLists.txt
This was getting a bit unwieldy. The include path setup is not perfect yet, that's work for later.
(It's about time we're getting C++20 with modules so that this include path madness can be put to an end.)
Also made the decode_vorbis function in DUMB a function pointer so that the library does not depend on high level code and can just ignore the vorbis case if no supported.
Currently all it contains are the MIDI sources and the MIDI devices, the rest needs to be reworked first.
# Conflicts:
# libraries/zmusic/i_module.cpp
# libraries/zmusic/i_module.h
# src/CMakeLists.txt
# src/i_module.cpp
# src/i_module.h
# src/sound/music/midi_cvars.cpp
# src/utility/i_module.cpp
# src/utility/i_module.h
# Conflicts:
# src/CMakeLists.txt
# src/sound/musicformats/music_opl.cpp
