User console inputs

Currently, the only way to interact with the Programm is over the console.

For this, the client has a command listener that is a modular system with commands a wirten command with a class or function to execute. Devs can always add new commands without many issues.

Currently their are several commands wiche serve different functionalities:

Command	Discription
CHAT	command to create, read and write into chats
CONNECT	connect to a server (Register/Log in)
DISCONNECT	disconnect from a sever all all of them
EXIT	close the programm
HELP	print all commands or get more info about a single command
SELECT	select the current active connection when 2 or more connection are established
STASH	sync with the server to get all data like invites / message etc.
USERS	get informations about other users