Multiplayer level editing (Patreon)

Working on multiplayer (cooperative) level editing, so far players can send invites to join map editing together (with more than 2 players too, there is no top limit but most likely server won't be allowing too many since it will cause high traffic usage) connect, disconnect, see each others' selected objects (and conflicts, in red), change stuff.

Not complete yet is: object creation, deletion, chat, cursors(?), camera positions(?), some sort of connected level designers list.

Map designers connect to one specific map owner, though they probably would be able to save copies of a map to themselves too, independently.

It also feels like I need to rewrite service that handles message delivery between clients - could be too slow for high number of players as of right now.

Also, added connection lines and in-world captions.