Multiplayer (movement for now)

[EdgarTip]

Implement multiplayer in game. This issue is considered finished when 2 different players appear in the same map.

• [x] tick system on a thread
• [x] broadcast game state every tick
• [x] handle inputs (movement for now) on server
• [x] client reads player list and renders all players keeping their positions updated
• [x] client is able to start the lobby
• [x] client receives server messages and is able to interpret them in a correct and structured way
• [x] finally: two or more players can move around !

[MigDinny]

Created a server-protocol.txt which specifies the game protocol. All client<>server possible comms must be specified there!

• tick system is implemented. it runs on a separate thread every 5 seconds (so we have a chance to properly debug, for now...)
• the game state is broadcasted to all clients every tick. for now, the gameState only has the list of players (with, obviously, their positions, hp, xp, etc)
• the server handles inputs for movement

What is the next step?

The client must have a structured way to receive messages and update its internal global variables accordingly.

[MigDinny]

Everything is done now on multiplayer-edgar branch.

Some minor bugs are there but nothing that compromises the multiplayer feature itself

• map is not aligned, players are disaligned, probably a thing with an array starting in 0 or 1

• animations are off

[MigDinny]

@EdgarTip faz PR e deixa a tua review, para eu depois dar final review and merge