This commit adds the files needed for running the trajopt planner example that is found in the
[moveit_tutorials](https://ros-planning.github.io/moveit_tutorials/doc/trajopt_planner/trajopt_planner_tutorial.html).
This planner is not included into `move_group.launch` by default but can be invoked via the `pipeline` argument.
This was done since it is not yet officially released (see https://github.com/ros-planning/moveit/issues/1467).

* Add stomp planner

This commit adds all the scripts needed to run the STOMP planner example in the
[stomp_planner_tutorial](https://ros-planning.github.io/moveit_tutorials/doc/stomp_planner/stomp_planner_tutorial.html).

* Add demo_chomp.launch
* Restore original 'chomp_planning.yaml' config
* Add CHOMP post-processing example, using OMPL+CHOMP

applying the following changes:
- Use `fixed` virtual joint
- Remove `panda_finger_joint1` from `hand` group (it's automatically included via finger links)
- Configure correct controller names provided by `franka_ros`:
  - arm: `joint_trajectory_controller` (`FollowJointTrajectory`)
  - hand: `franka_gripper` (`GripperCommand`)
- Change author to MoveIt maintainer team