RVIZ based on Ignition Rendering Library

RViz has undeniably been a key component of every ROS developer during the development of their robot’s software stack. With the recent development in ROS2 and the refactor of Gazebo’s source code into smaller modular libraries i.e. Ignition libraries, RViz also needs a much deserved revamp. As a part of the GSoC project, a prototype of RViz will be developed from scratch using the ignition rendering library and loadable visualization plugins supporting both ROS2 and ROS.