Add the ability to render out the current recording time during a session recording

include/openspace/interaction/sessionrecording.h

@@ -27,6 +27,7 @@
 
 #include <openspace/interaction/externinteraction.h>
 #include <openspace/interaction/keyframenavigator.h>
+#include <openspace/properties/scalar/boolproperty.h>
 #include <openspace/scripting/lualibrary.h>
 #include <vector>
 
@@ -65,6 +66,12 @@ public:
      */
     void preSynchronization();
 
+    /**
+     * If enabled, calling this function will render information about the session
+     * recording that is currently taking place to the screen.
+     */
+    void render();
+
     /**
      * Current time based on playback mode
      */
@@ -209,6 +216,8 @@ public:
     std::vector<std::string> playbackList() const;
 
 private:
+    properties::BoolProperty _renderPlaybackInformation;
+
     enum class RecordedType {
         Camera = 0,
         Time,