Draft: Merge gtk4 port back into DING

Marco Trevisanrequested to merge
3v1n0/desktop-icons-ng:gtk4-port into master

Merge back https://gitlab.com/smedius/desktop-icons-ng/ into this repository.

Use again DING namespace.

Stuff to do:

  • Check translations in weblate
  • To be fully tested (it all works in my basic tests)

/cc @smedius

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