Cyberghost support (#168)

* Host finder CLI for cyberghost
* Resolver program updated with Cyberghost data
* Gluetun cli clientkey subcommand

internal/models/alias.go

@@ -21,6 +21,10 @@ type (
 	WindscribeRegion string
 	// SurfsharkRegion is used as the region for a Surfshark server
 	SurfsharkRegion string
+	// CyberghostRegion is the country name for a Cyberghost server
+	CyberghostRegion string
+	// CyberghostGroup is the server group for a Cyberghost server
+	CyberghostGroup string
 	// URL is an HTTP(s) URL address
 	URL string
 	// Filepath is a local filesytem file path