Syncronize usage of LOCATION property with google calendar

dengste/org-caldav#13 asks for org-googlemaps support for org-caldav. In this case three packages are involved: org-caldav, org-mode (ox-icalendar) and google-maps.el.

As far as I understand, LOCATION in iCalendar can be anything: geocoordinates, addresses, room numbers, a mixture of them …

Probably LOCATION should be considered as a free form field that should be interpreted according to its contents by google-maps.el (and openstreetmap.el which would be often more useful in my region).

In that case we could circumvent any action of org-caldav and advise ox-icalendar to copy geolocation and/or address into location if the latter is empty.