The organization here is now the same as for the Timidity++ device, i.e. it is the device owning the instruments to give better control over their lifecycle.
# Conflicts:
# src/sound/timidity/instrum_font.cpp
# src/sound/timidity/instrum_sf2.cpp
# src/sound/timidity/mix.cpp
# src/sound/timidity/playmidi.cpp
# src/sound/timidity/resample.cpp