Add rotation to GCPs

Add an optional option to not only mark GCPs but also set orientation. This way it would be easier to check accuracy of marked GCPs or even user tie points.
To check accuracy often it is good to quickly switch between marked photos and see them "animated" this way it is easier to check if same feature is marked especially if no clear GCPs are used. Now as rotation is not accounted for the "animation" effect is not good enough.