Restored some changes lost in merge + "timedots"

Added impact on trails from start/stoptime definitions in modfile.
Added dots of equal time in trails, no progress on printing the time
string.

include/openspace/rendering/renderabletrail.h

@@ -63,6 +63,7 @@ private:
     properties::Vec3Property _lineColor;
     properties::FloatProperty _lineFade;
     properties::FloatProperty _lineWidth;
+	properties::BoolProperty _showTimestamps;
 
     ghoul::opengl::ProgramObject* _programObject;
     bool _programIsDirty;