* Linux/Keyboard: Fix program using wrong modifier
  keys if starting the program while holding a
  modifier key and other situations.
* Sequencer: Change "Source channel" to "Input channel"
  in the recording options dialog.
* Api: Document consistant behavior and fix reading
  an uninitialized variable in case running an
  osc-method fails.
* Packages: Fix libgig checking loops in soundfonts.
  This fix a regression from 2021. Bug found
  by @linux-leo.
* API: doAddNotesWhenReleasingKeys,
  setAddNotesWhenReleasingKeys.