Pause the server when a player is connecting

[ScribbleTAS]

The problem

The client needs a few ticks before it's loaded. In that time, the server might have already ticked more and RNG will be totally different.

The main problem lies in the clientworld not updating correctly once the server starts.
We may need to tick the client world to try and load it.

Multiplayer

A far bigger concern is multiplayer. Players joining the game may take more or less time...
Maybe paired with #148 this might be a solution, but for now I will concentrate to fix this problem on the client.

Todo

• Make the server pause when starting
• Once the player is done connecting, the client should send the correct tickrate to the server