Add `x-checker-data` for all modules & Remove `zlib`

[guihkx]

This adds support for Flathub's external data checking tool, to help maintainers keep all modules up-to-date. In the process, I've updated xrandr from 1.5.1 to 1.5.2.

In addition, I've updated the checking source for Prism itself, which was previously using Anitya but now checks for GitHub Releases directly, which is faster.

And finally, I've also removed the zlib module (introduced because of #15), since the 22.08 version of the Freedesktop runtime is now using the latest, current version of it (v1.2.13):

https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/commit/4fc255e155ef8d2f5a1ec593784b61527c1d829f

---

Miscellaneous changes (not worthy of their own, separate commit, IMO):

• Remove some leftover files created by some modules (C headers, static libraries, pkg-config files, manpages)
• Separate each module by a new, empty line (this is REALLY important)

• Replace inline YAML arrays (e.g. [foo, bar, baz]) by lists (also very important):

  - foo
  - bar
  - baz

[flathubbot]

Started test build 46205

[flathubbot]

Build 46205 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/28826/org.prismlauncher.PrismLauncher.flatpakref