Intermediate result to change viewpoint from Jupiter projection to Plutoprojection

include/openspace/rendering/planets/renderableplanetprojection.h

@@ -88,11 +88,11 @@ private:
 	glm::mat4  _projectorMatrix;
 
 	// spice
-	std::string _sequenceFile;
 	std::string _instrumentID;
 	std::string _projectorID;
 	std::string _projecteeID;
 	std::string _aberration;
+    std::vector<std::string> _potentialTargets; // @TODO copy-n-paste from renderablefov
 	float _fovy;
 	float _aspectRatio;
 	float _nearPlane;

include/openspace/rendering/renderablefov.h

@@ -88,6 +88,7 @@ public:
 	std::string _method;
 	std::string _aberrationCorrection;
 	std::string _fovTarget;
+    std::vector<std::string> _potentialTargets;
 
 	glm::dvec3 ipoint, ivec;
 	glm::dvec3 _previousHalf;