Migrate to new App ID: org.small_tech.Gnomit

Housekeeping changes by Sonny Piers

Add explicit support for git merge messages; update GNOME runtime

Gnomit now also supports git add -p messages and rebase -i messages

Dark theme support

Version 1.0.4: Uses regular window with buttons in the header bar

Thanks to Sergey Bugaev for the patch :)

Gnomit is now Unicode-aware 🤓

Also, fixes a couple of minor bugs.

Implements support for tag messages

Also gracefully handles auto-generated commit message bodies longer than a single line.

Addresses issues raised during Flathub submission

See: https://github.com/flathub/flathub/pull/570

Initial release