[polari] (4 commits) Created branch wip/fmuellner/cleanups

[Gitlab Administrative User <gitlab src gnome org>]

The branch 'wip/fmuellner/cleanups' was created.

Summary of new commits:

  4975209... cleanup: Use Array.includes() to check for element existenc
  32a12cf... cleanup: Replace more plain objects with Maps
  0c2cece... cleanup: Use class methods for singleton pattern
  a7842dd... cleanup: Use class getters instead of globals