Embed HTTP Server Into Game Binary

[billyb2]

Currently, in order to start a multiplayer game, players must set up an HTTP server and then connect to it, as well as dealing with HTTP header stuff. This takes a moderate amount of technical skill, which can be frustrating to end users. By embedding an HTTP server into the game's binary, and just having some text when hosting a game saying Tell your friends to point their web browsers to {SERVER_IP}:4000, it would make the game significantly easier to play at little cost. We could legitimately just set up a TCP server, no dependencies needed, as no matter what we're only going to be loading like 3 files total. We would, of course, want to embed the index.html file using include_str, and make sure users can't get remote file system access to any file, only specific hardcoded ones.