Simple KCM for KRDP

Adds a basic KCM for the KRDP. All settings are the parameters the server binary exposes for now.

Could use also ideas and feedback from @teams/vdg since currently it's very basic looking.

Current implementation saves and loads settings to ~/.config/krdpserverrc file, and autogenerates the certificates to ~/.local/share/krdpserver/

Todos

• Create list of users instead of one user
• Show a warning if user has no h264 encoding
• Show the local ip address if ip address is unset
• Autostart item
• Switch to toggle server on or off?
• Hook everything up with the server implementation
• System tray notification for the server
• Check if server is running or not and set the toggle accordingly