🎉 Replace old Http and MasterServer code with a new API interface

[Zentro]

As part of the efforts to modernize multiplayer and online experiences, these changes will allow for the server to interact with the "new" API.

As part of these changes:

• You will now need to register a API key for your server to be listed
• The config file will now include a server identifier and the API key
• The server will no longer quit if it can't reach the "master server"
• The user authentication system will no longer depend on the API
  What does this mean? You no longer have to copy and paste a long token into your client. Instead, you can create one directly from your client and use it to identify yourself as a server "admin" or "mod." If you're logged in with your forum account, your client will automatically send a temporary challenge request to the API. The server can then use this request to verify your identity against the API and assign you the "ranked" role.