Enhance appdata with more fields used by GNOME Software, Flathub etc.
- Add OARS ratings which are required to drive parental controls software and for Flathub
- Add Releases and Developer name which improve display in GNOME Software (and eventually Flathub)
- Add bugtracker and donation URLs to improve display in GNOME Software (and eventually Flathub)
I didn't initially see an online version of the Help manual while browsing help.gnome.org otherwise I'd have linked that in a url type help tag as well.
Note: this could be closed in favour of !11 but I wanted to try and make sure the unrelated improvements get in ASAP.
Edited by nick richards