appdata: Appdata related changes
- Rename appdata file into metanifo file
/app/share/appdataand%{id}.appdata.xmlare considered to be the legacy path and filename, respectively.
https://docs.flathub.org/docs/for-app-authors/metainfo-guidelines/#path-and-filename
- Validate desktop file
- Validate metainfo file
- Use appstreamcli to validate appdata
- Use shorter summary to avoid appstreamcli warning
- Validate gschema file
- Add developer block
- Add vcs-browser and translate URLs
- Add lanuchable tag
- Use AORS 1.1 to remove the
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