Resolve "Frame/Capture/Feature/Landmark Other as list/vectors in FactorBase"

Closes #294 (closed)

include/core/factor/factor_base.h

@@ -144,6 +144,14 @@ class FactorBase : public NodeBase, public std::enable_shared_from_this<FactorBa
          **/
         CaptureBasePtr getCapture() const;
 
+        /** \brief Returns a pointer to its frame
+         **/
+        FrameBasePtr getFrame() const;
+
+        /** \brief Returns a pointer to its capture's sensor
+         **/
+        SensorBasePtr getSensor() const;
+
         /** \brief Returns the factor residual size
          **/
         virtual unsigned int getSize() const = 0;