[1.5.0-dev-1] Multiplayer work in progress

Hi everyone (or only myself for now),

At the moment I am focusing on multiplayer features.

The mini goal is to keep the Player's position in our remote database and when the player logs in to the game, he/she/whatever will appear back to the position retained by the database.

Once it is done, coming up will be :

1. Spawning other players
2. Sync all players stats with the database

See you soon!