FTR: Server Config should be Visible for Clients

[proof88]

Server must send some of its configuration parameters (such as tickrate, max FPS, game end goal, etc.) to the clients so clients will be also aware.
This task is NOT for visualization of these parameters but just making the clients aware of these.
Visualization task is a different task: #291 .

For example, when client is connecting, it should receive game end goal and if it is time limit, then the number of remaning seconds so the client can also count back without the server (even though the server will send a game end signal at the end).
Configured respawn time should be also sent so clients can visualize the remaining respawn time without the help of server.

[proof88]

Done for v0.2.3.