Same as Qt, validate the server address the user enters and prevent the
user from continuing in the wizard or clicking 'Ok' in the ServerConfig
if the entered address is clearly invalid.
Previously the server parameters were each handled differently, e.g. auto-connect was only applied when updating Network.server
and not when Config.autoConnect was updated. Similarly, updating Network.server did not restart the network, leading to >1 connection
when Network.oneServer was set to True before updating Network.server.
Consolidate server parameter updates into a single call, remove the individual setters, and move Config.autoConnect and Config.autoConnectDefined to Network.
Sander van Grieken