Add links to common mapping websites

[floledermann]

A list of links to replicate the current map view in common mapping services should be provided:

Eamples / URL Schemes:

• Google Maps https://www.google.at/maps/@48.1976177,16.3885253,14z
• Openstreetmap http://www.openstreetmap.org/#map=14/48.2327/16.4173