Added support for Identifiable UID in MAPRegistrationWrapper(IO)
- Setter and Getter of Identifiable are virtual now, to allow the override in classes that provide there own UIDs
- Changed interface of the wrapper. Constructor now needs pointer to the registration (as it makes no sense to instatiate a wrapper w/o a registration
- Fixed T24302
Signed-off-by: Ralf Floca <r.floca@dkfz-heidelberg.de>