Multiplayer added

Currently, the server is on my laptop, which means it can shoot down. It probably has bugs, which are currently is work in progress. 

If there is only one player per game, bot added for the opposite team, if at least two players available, no bots are added.

Shop and many other things are not implemented for multiplayer yet. 

Currently, if the host leaves the game, the game ends

Even tho it can host multiple lobbies, it can't handle multiple games at the same time, this is something I am working on