Location detail page

[Mantus667]

Add a detail page for locations where the location information is displayed and also which next events will occure on this location.

Add new property to have a description text for locations and also add media picker to allow pictures for locations.

Add URL rewriting rules for detail pages on package install

[Mantus667]

Implemented basic location detail page.
Created new macros to list latest/upcoming events for location.

[Mantus667]

Starter refactoring of EventLocation, LocationService and all related parts