Resolve "Emplace API inconsistent with ProcessorTrackerFeature/Landmark functions"

Closes #191 (closed)

include/core/capture/capture_base.h

@@ -61,7 +61,6 @@ class CaptureBase : public NodeBase, public std::enable_shared_from_this<Capture
 
         FrameBasePtr getFrame() const;
         void setFrame(const FrameBasePtr _frm_ptr);
-        void unlinkFromFrame(){frame_ptr_.reset();}
 
         virtual void setProblem(ProblemPtr _problem) final;
         FeatureBasePtrList& getFeatureList();