Network Updates (Mods/News/Updates/...)

[numpad]

Add a basic mechanism to receive news/updates/list of available mods/... from an external source.
This should probably be separate from the game server?
This should just be static information. Like from a git repo hosted somewhere.
The client needs to do the diff itself. (If at some point it is absolutely required to have dynamic content, we could specify a user ID in the request and implement our own dynamic server).

Usecases:

• Fetch the last 5 news entries as json from example.com/news.json.
• Fetch the most popular mods from example.com/mods-landingpage.json. We could do this json-api pagination thingy: next: "example.com/mods-page2.json".
• Compare local ENGINE_VERSION to example.com/latest-version.json. If lower, show an update banner.

Might be cringe, but fun:

• Do a vcpkg and make a github repo the official/approved mod source. would automatically allow to add third party repos?
• Allow any user to input any url "other.example.com/3rd-party-mod.json" to download a custom mod from?

Open Questions:

• Why not just do this using the gameserver? All networking would be centralized, which is simpler to maintain than two separate systems. OTOH it's currently less reliable to self-host for me.