Early version of multiplayer

Multiplayer is now available in the game. This is a very early version.
You can test how it works in a multiplayer game:
- Connection
- Lobby list
- List of players
- Character animations
- Synchronization of position and movements
Also fixed several bugs with controller management.
Added the interior of a large house.
Further updates will be aimed primarily at the development of multiplayer, improving optimization and fixing bugs.