Games in stand-alone codeworld-api

Development of games has left the stand-alone hackage release behind. This issue tracks the need for feature parity.

It's unclear whether these games should connect to the code.world/gameserver endpoint just as the JavaScript ones do. In some ways, I'd prefer to spawn a game server locally, so that the details of the game server protocol don't become relevant to backward compatibility.

Compare the stand-alone Hackage release with the current JavaScript games to identify the missing feature parity. Resolve whether games should use the code.world/gameserver endpoint or spawn a local game server, then verify that the stand-alone release supports the same games without exposing protocol details that affect backward compatibility.

Written by the indexing model from the issue text.