Add boost include, missing in upcoming PCL versions (ros2) (#374)

* Remove name of nonexistent PCL component (core)
Probably, common is meant, which is also requested

* Add boost include, missing in upcoming PCL versions
Was removed in pcl/conversion.h here: https://github.com/PointCloudLibrary/pcl/commit/292593abd3b69af315c7fe3379363bdce7800d5a

pcl_ros/CMakeLists.txt

@@ -10,7 +10,7 @@ endif()
 
 ## Find system dependencies
 find_package(Eigen3 REQUIRED)
-find_package(PCL REQUIRED QUIET COMPONENTS core common features filters io segmentation surface)
+find_package(PCL REQUIRED QUIET COMPONENTS common features filters io segmentation surface)
 
 ## Find ROS package dependencies
 find_package(ament_cmake REQUIRED)

pcl_ros/include/pcl_ros/point_cloud.hpp

@@ -57,6 +57,7 @@
 #endif
 #include <pcl_conversions/pcl_conversions.h>
 #include <sensor_msgs/PointCloud2.h>
+#include <boost/foreach.hpp> // for BOOST_FOREACH
 #include <boost/mpl/size.hpp>
 #include <boost/ref.hpp>
 #include <string>