Map cacheing for < 5.5.0 was broken and we were using whatever default was provided by QtLocation. Now we're properly creating and configuring a cache manager.

Updated Google Maps API Version
Updated User Agent used for map tile requests

Restructured to better fit existing build structure

Added Bing Hybrid Map
Added Open Street Map
Set map selection menu checks (exclusive check)
Handle proper image type otherwise disk caching fails

As this is no longer google specific, renamed everything google to qgc.