Resolve "ProcessorTracker compatible with preprocessing and other processors"

Closes #309 (closed)

include/core/processor/processor_tracker_feature.h

@@ -150,8 +150,8 @@ class ProcessorTrackerFeature : public ProcessorTracker
         virtual bool voteForKeyFrame() const = 0;
 
         // We overload the advance and reset functions to update the lists of matches
-        void advanceDerived();
-        void resetDerived();
+        virtual void advanceDerived() override;
+        virtual void resetDerived() override;
 
         /**\brief Process new Features
          *