Major improvements in the CLI Manager

- The port for the internal web server is now checked when the user choose one new
- The main screen is now refreshed when the user modifies the configuration
- The daemon status ("CentralReport is not running" / "CentralReport is running with PID xxx") is now updated when the user starts/stops/restarts the daemon
- The daemon status is modified when the daemon is starting/stopping ("Starting CentralReport…" / "Stopping CentralReport…" / "Restarting CentralReport…")

Tech:
- The urwid main_loop is now located in the "WindowCli" class. It's more logical and can be updated directly within the object.