Inform about and check for internet connection

ServerPackCreator requires a working internet connection.

When starting, check for a working internet connection by trying to ping varous DNS-servers. If they can not be reached, display an error message to users in CLI and GUI

changed milestone to %Version 5 - Peauty!!11!

added Feature label

assigned to @Griefed

added Rejected label

Rejected: Any check made by SPC is not as reliable as potential checks made by the users OS, as well as it being the users responsibility to check their internet connection.

closed