open-directory: Add new plugin

Add a new plugin, open-directory to opens the containing directory
of the playing video.

Closes: #146
4 jobs for wip/hadess/open-directory in 11 minutes and 38 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #223409
build-fedora

00:03:59

passed #223410
flatpak

00:10:57

 
  Review
passed #223411
review

00:00:40

manual #223412
allowed to fail manual
stop_review