Complete rename to Luanti in package metadata

[appgurueu]

Primarily preparations for a Flathub resubmission, but also renames the .desktop file and the AppImage.

Plan:

• Fix segfault on exit: Flatpak: Segfault in curl deinitialization #16016 ?
• Get this PR merged
• Resubmit to Flathub after editing https://github.com/appgurueu/flathub/tree/new-pr
• Old ID added to provides and replaces tags of new Metainfo file
• Requirements should be fulfilled
• Built & tested
• Run linter (manifest & repo)
  • Only manifest error is module-luanti-source-git-branch which will go away after testing.
  • Only repo error is this one
    which should be unproblematic.
    (And a warning about missing captions for screenshots.)
• Compared against old PR (Build manifest for net.minetest.Minetest flathub/flathub#20), patches should be obsolete
• Merge PR for EOL rebase on old package

Resources:

• https://docs.flathub.org/docs/for-app-authors/maintenance#renaming-the-flatpak-id
• https://docs.flathub.org/docs/for-app-authors/requirements
• https://docs.flathub.org/docs/for-app-authors/submission
• https://docs.flatpak.org/en/latest/manifests.html

[sfan5]

looks ok

[sfan5]

Can this be merged?

[appgurueu]

I think so. However it might be better to wait just until before we release 5.12 so I can open the PR https://github.com/flathub/flathub/compare/new-pr...appgurueu:flathub:new-pr?expand=1 against that then (so it goes merge this -> tag 5.12 -> submit PR pinning 5.12 to flathub).

[sfence]

Whitespace check should be updated to ignore XML files before the merge.