Fix build flags, update core

This MR fixes the fact that you couldn't build the framework with just cmake .., because the USE_* weren't used consistently. This should be fixed now. I also introduced new CI jobs to test this, and to execute all the examples

Detectors/CMakeLists.txt

 add_subdirectory(GeometryInterfaces)
 add_subdirectory(GenericDetector)
-add_subdirectory(RootDetector)
+add_subdirectory_if(RootDetector USE_TGEO)
 add_subdirectory_if(DD4hepDetector USE_DD4HEP)