Moving CORSFilter to the controller.cors package, so that removing the
package would remove CORS completely...
tweak to avoid two headers for CORS in the response...
Merge branch 'OPTIONS-CORS' of https://github.com/nopbyte/compose-idm
into OPTIONS-CORS

Conflicts:
	src/main/java/de/passau/uni/sec/compose/id/rest/controller/cors/CORSController.java