Release as a GTK+ app using Flatpak
I'm considering releasing Planalyzer as a Flatpak app. This would be most convenient for my use case.
Requirements for a first release:
- Build system to produce flatpak app -- need to use flatpak-builder, so we can deploy to Flathub [may need to use Meson too; let's see]
Requirements for subsequent releases:
- UI in the application for where to scan for plans