Yutaka Kondo

This PR fixes #220 Environment: - OS: Ubuntu 16.04 - ROS: Kinetic

Use smart pointer instead of raw pointer

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Modern C++ is preferred to use smart pointer instead of raw pointer for safer programming. But the current implementation is written using raw pointers e.g.: - https://github.com/ros-controls/ros2_control/blob/master/hardware_interface/include/hardware_interface/handle.hpp#L73 - https://github.com/ros-controls/ros2_control/blob/master/hardware_interface/include/hardware_interface/robot_hardware.hpp#L136-L138 Why...

[DO NOT MERGE] Build on humble

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Do not merge until the 3rd edition of the book published.

refactor(docker): introduce rosdep-installed stage

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## Description This PR introduces the `rosdep-installed` stage before the `prebuilt` stage to execute `rosdep install` only one time. ## Tests performed Not applicable. ## Effects on system behavior Not...