begin gis-dp integration

* adapt url scheme for wms tiles
* image response added
* new backend for wms tiles started
tile bounds
aerial images

* support for wms aerial images from geoserver
* fix default rewritebase
buildings, caching

* adapter for WFS added
* building silhouettes are provided
* module phpfastcache added
refactoring
extruded buildings
refactoring
reenable caching
remove submodule phpfastcache
add phpfastcache directly