Mod auto-download (MAD) tracker

[Alystrasz]

While there is some progress on the feature, multiple bugs must be fixed before it can be publicly released.

Core problems

• Fetch manifesto when trying to download a mod (and not before)
  • Launcher PR: Only fetch MAD manifesto on server join NorthstarLauncher#751
  • Mods PR: Only fetch MAD manifesto on server join NorthstarMods#821
• Revert Add a generic "JoinServer" function NorthstarMods#693 via Revert "Add a generic "JoinServer" function" NorthstarMods#828
• Update manifest structure to allow for download sources other than Thunderstore
  • Verified Mods PR: feat: Adjust JSON structure to allow for other mod sources (but better) VerifiedMods#41
  • Launcher PR: Adjust for restructured verified-mods.json NorthstarLauncher#748
• Cancellable install
  • Launcher PR: feat: Make MAD process cancellable NorthstarLauncher#815
  • Mods PR: feat: Make MAD process cancellable NorthstarMods#865
• Game state is not correct when MAD process fails (Issue on mod download failure NorthstarLauncher#756)
  • Rework MAD cleanup handles NorthstarLauncher#817
• Handle multiple mod versions NorthstarLauncher#757
  • Launcher PR: fix: Mod versioning NorthstarLauncher#828
  • Mods PR: fix: Mod versioning NorthstarMods#903

Minor issues

• Only auto-download mod after server password entry NorthstarMods#781
  • fix: Download mods after password prompt NorthstarMods#922
• Remote mods are listed in enabledmods.json NorthstarLauncher#850
  • fix: Do not enable remote mods on first load NorthstarLauncher#862