[polari] (12 commits) Non-fast-forward update to branch wip/fmuellner/debug-instance

[Gitlab Administrative User <gitlab src gnome org>]

The branch 'wip/fmuellner/debug-instance' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  618991d... app: Add --debug command line flag
  25cb6b7... flatpak: Pass --debug flag when launched from Builder
  646f775... window: Differentiate debug instances from normal ones

Commits added to the branch:

  228d81a... build: Include prefix in libdir & co. (*)
  d546070... cleanup: Use Array.includes() to check for element existenc (*)
  caa067a... cleanup: Replace more plain objects with Maps (*)
  8abb0ed... cleanups: Remove unused imports (*)
  e8d14c6... cleanup: Regroup imports (*)
  7501530... cleanup: Import classes directly where it makes sense (*)
  0ab064a... cleanup: Make singleton classes public (*)
  ad43c20... cleanup: Use class methods for singleton pattern (*)
  e611aa3... cleanup: Use class getters instead of globals (*)
  8fe8ac9... app: Add --debug command line flag
  6c08707... flatpak: Pass --debug flag when launched from Builder
  a4d1826... window: Differentiate debug instances from normal ones

(*) This commit already existed in another branch; no separate mail sent