Feature/night sky items (#2613)

* added night sky items and camera event
---------

Co-authored-by: Alexander Bock <alexander.bock@liu.se>

include/openspace/interaction/camerainteractionstates.h

@@ -58,7 +58,7 @@ public:
      * Returns true if any of the velocities are larger than zero,
      * i.e. wether an interaction happened
      */
-    bool hasNonZeroVelocities();
+    bool hasNonZeroVelocities(bool checkOnlyMovement = false);
 
 protected:
     struct InteractionState {