feat: Allow sending files by copy-pasting them from file managers

Import Userrequested to merge
file-pasting into master
  • Gtk.Clipboard.wait_for_uris() and Gtk.Clipboard.wait_is_uris_available() need to be typed somewhere
  • Is there a graceful way to prevent TextView from insolently pasting text despite the fact we're handling paste-clipboard ourselves?
  • Separate commit for send-file action refactoring?
  • Better commit message wording
Edited by Import User

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