Switch to using the full screenshots in the metainfo files. These URLs should not change.
I've checked them, and I've added a comment that should help with the confusion as a result of their being both PNGs and JPGs. My impression is these should be pulled infrequently such as when flatpak and Linux repo packaging is done each Freedoom release, or Linux distro release.
These should now be "forever" URLs linking to image files that can be overwritten with each release without touching these XML files each time.
**Linking to the thumbnails is intentional.** Unlike the full screenshots the shrunken jpegs will always be smaller than pngs for these, so we never need to change the file extension; and there's really no reason for making everyone download huge screenshots with this stuff anyway - they can go to the website for that.
The current website organizes everything so that we have 8 screenshots of each game, numbered 1-4 for Chocolate and 5-8 for GZ. Including screenshots 1, 2, 7 and 8 therefore should give us a fairly representative variety.
Current Desktop Entry and AppStream standards recommend using
reverse-DNS for all relevant files under them.
Adds some more scaffolding targets for install/uninstall, but there
aren’t easy text transformations to the new names.
