Motivation for this change

The bleed version of OpenRA had the wrong hash and most mods have had updates. The Zenity error now shows actual newlines rather than \n. Mods have been updated automatically with a script, which is included in the PR.

Update 2: Downgraded kknd to a older commit and upgraded dr to an even newer commit to make them both work. They should now all run.
Update: @fusion809 tested them and found that only kknd and dr need fixing.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.