change of namespaces to support DD4hep 1.00.01 (was ACTS-332)

Original author Robert Johannes Langenberg @rlangenb

The new DD4hep version has simplified its namespace structure (and capitalization), as well as moving some functionality: to call worldTransformation on a detector element, you now have to specify if you want "nominal" (ideal) or "survey" (measured) location.

verifyObject() does not exist anymore. it used to throw an exception if the handle was assigned the wrong object type, but the exception is now thrown automatically, either at link-time or at runtime during assignment.