Tron example

[Menduist]

Far funnier than a chat example

Thanks @lchenut for the single player version that I adapted to libp2p here Currently waiting on #771 and #783 to be fully functional.

Also adds some QoL features, including a fix for #774

(Will) demonstrate:

• Discovery (for finding peers)
• GossipSub (for matchmaking)
• Direct connection & custom protocols (for the actual game)

Other examples to add:

• GossipSub
• Discovery
• Nat Traversal