collective construction meta build tool - parallel executor

 This package is part of ROS 2, the Robot Operating System.
 colcon is a meta build tool to improve the workflow of building, testing and
 using multiple software packages. It is the recommended tool for ROS 2 to set
 up workspaces and build packages from source, but can also handle old ROS 1
 workspaces.
 .
 This package provides a parallel executor to build multiple packages in
 parallel.