Image sequencing improvements and optimization of projection.

Projection now occurs only at specified timestamps.
Todo:
projection class now dependent on image sequences, will have
to change that once we read specific instrument schedule.

include/openspace/rendering/planets/renderableplanetprojection.h

@@ -88,6 +88,7 @@ private:
 	glm::mat4  _projectorMatrix;
 
 	// spice
+	std::string _sequenceDir;
 	std::string _instrumentID;
 	std::string _projectorID;
 	std::string _projecteeID;

include/openspace/rendering/renderablefov.h

@@ -69,7 +69,8 @@ public:
 	glm::dvec3 interpolate(glm::dvec3 p0, glm::dvec3 p1, float t);
 	glm::dvec3 bisection(glm::dvec3 p1, glm::dvec3 p2, double tolerance);
 
-	double distanceBetweenPoints(psc p1, psc p2);
+	void computeColors();
+
 	// instance variables
 	int _nrInserted = 0;
 	int _isteps;
@@ -114,7 +115,10 @@ public:
 	// time
 	double _time = 0;
 	double _oldTime = 0;
-	int _delta  = 0;
+
+	// capturetime
+	double _timeInterval;
+	double _nextCaptureTime;
 };
 }
 #endif