towards removing more static/global vars
remove vibrato globals - integrate to tonegen
no more static/global midi map
prepare removal of preamp globals
overdrive instance variable
Clean up MIDI event handler

adapted akapelrud's patch e414f0d9
LV2 overdrive instance
remove static globals from program table
fix small mem-leak
clean up code
fix 9dbaf4d (program offset)
meaningful debug defines
multiple instance LV2 plugin
clean up
prepare changelog
github downloads are EOL