Resolve "Work on const / non-const in wolf base classes"

Closes #184 (closed)

hello_wolf/processor_range_bearing.h

@@ -56,9 +56,9 @@ class ProcessorRangeBearing : public ProcessorBase
         // Implementation of pure virtuals from ProcessorBase
         virtual void processCapture     (CaptureBasePtr _capture) override;
         virtual void processKeyFrame    (FrameBasePtr _keyframe_ptr, const Scalar& _time_tol_other) override {};
-        virtual bool triggerInCapture   (CaptureBasePtr) override { return true;};
-        virtual bool triggerInKeyFrame  (FrameBasePtr _keyframe_ptr, const Scalar& _time_tol_other) override {return false;}
-        virtual bool voteForKeyFrame    () override {return false;}
+        virtual bool triggerInCapture   (CaptureBasePtr) const override { return true;};
+        virtual bool triggerInKeyFrame  (FrameBasePtr _keyframe_ptr, const Scalar& _time_tol_other) const override {return false;}
+        virtual bool voteForKeyFrame    () const override {return false;}
 
     private:
         // control variables