changing costmap layers private to protected (ros-navigation#3722)

Signed-off-by: enricosutera <enricosutera@outlook.com>

Author: SteveMacenski

nav2_costmap_2d/include/nav2_costmap_2d/inflation_layer.hpp

@@ -188,7 +188,6 @@ class InflationLayer : public Layer
    */
   void onFootprintChanged() override;
 
-private:
   /**
    * @brief  Lookup pre-computed distances
    * @param mx The x coordinate of the current cell

nav2_costmap_2d/include/nav2_costmap_2d/range_sensor_layer.hpp

@@ -128,7 +128,7 @@ class RangeSensorLayer : public CostmapLayer
    */
   void bufferIncomingRangeMsg(const sensor_msgs::msg::Range::SharedPtr range_message);
 
-private:
+protected:
   /**
    * @brief Processes all sensors into the costmap buffered from callbacks
    */

nav2_costmap_2d/include/nav2_costmap_2d/static_layer.hpp

@@ -123,7 +123,7 @@ class StaticLayer : public CostmapLayer
    */
   virtual void matchSize();
 
-private:
+protected:
   /**
    * @brief Get parameters of layer
    */

nav2_costmap_2d/include/nav2_costmap_2d/voxel_layer.hpp

@@ -133,7 +133,6 @@ class VoxelLayer : public ObstacleLayer
    */
   virtual void resetMaps();
 
-private:
   /**
    * @brief Use raycasting between 2 points to clear freespace
    */