trivial: Don't show a critical warning when failing to open an AppStream XML file
trivial: Do not show a warning if epiphany is not installed
trivial: When merging GsApp objects, also copy the related apps
Promote packages found in the desktop-db to kind normal+desktop
Add devassistant in the Development featured section
Show some UI to remove external sources
Add a refine flag to be able to refine the related applications
Automatically de-duplicate gs_app_add_related()
trivial: Fix make check