Added a new Module for XNAT.
Added a wrapper file for ctkXnatSession.h with micro service makro.
Added a Tracker for micro services.
Changed Xnat Plugin for the xnat session as a micro service.
Some few changes to the xnat module.
Little fixes to the validation.
Updated XnatEditor for useing the micro service "xnat session".
Merge branch 'bug-18051-UseMicroServicesForXnatSession'

Conflicts:
	Modules/CMakeLists.txt