Le mainscreen requests the connected clients from the server. LoginScreen no longer blocks the TCPController read thread.
Added default credentials for easier debugging.
Merge branch 'master' of https://github.com/JordySipkema/LD326_RH_A5

Conflicts:
	RH_APP/GUI/LoginScreen.cs
	RH_APP/GUI/MainScreen.cs
	RH_Server/Server/ClientHandler.cs
Fixed some merge errors
Merge branch 'master' of https://github.com/JordySipkema/LD326_RH_A5

Conflicts:
	RH_APP/GUI/LoginScreen.cs
	RH_APP/GUI/MainScreen.cs