Clean render window layer controller class
Get rid of unused / unnecessary functionality.
Several classes need to be modified accordingly.
Some functionality will be gone but it was never really used
in the test plugin org_mitk_gui_qt_renderwindowmanager.
Additionally the logic was changed such that passing a nullptr-renderer
not all renderer-specific properties were modified but the global /default
properties.
That's why the class no longer requires "controlled renderer".