Add image services support to Access Control

Currently access control support Mapservice, Featureservice and Geoprocessing. As image services are more and more frequently used there is a need to use AC for image services as well.

For example a customer has a lot of bathmetry data of different projects. Being able to process this in one service where based on which projectgroup the users resides is able to see it saves our customer a lot of services duplicates.