Command-line startup options

[krestenlaust]

Add command-line options for various actions, this would allow faster testing by starting up the projects with arguments.

Server:

• Option to host a server immediately on startup ✔ (--listen, -l)
• Option to accept first connection (Possibly a bad idea from a security standpoint)
• Option to auto-accept connection from specific endpoint
• Option to move window to specific window location
• Option to decide size of window on startup

Client:

• Option to connect to specific endpoint on startup ✔ (--connect, -c)

Both:

• Add documentation in readme