Smod titlebar check is not great

[Grover-c13]

https://github.com/Grover-c13/MultiAdmin/blob/master/mutliadmin/MultiAdmin/OutputThread.cs#L216

Needs to be changed to if (gameMessage.Contains("ServerMod - Version")) and moved to a constant.

Right now servermod exceptions mess up the titlebar and can cause MA to crash.

[ButterscotchV]

In extension, I'd suggest creating a new system for checking the messages and handling the events, the current one is very prone to errors