MAES 2.0 Galactic

This is the release of MAES 2.0 with support for ROS 2 Galactic.

To use:

1. Download the archive that fits your system, and unpack.
2. Follow the steps in README.md regarding ROSMode.
   2a. If you are using our docker image, make sure you are using the one tagged "galactic" (docker pull aaumaes/ros4maes:galactic)
3. Optional:
   a. Record your experiments and share the videos with us.
   b. Report any bugs you find, and leave any feedback you have in the discussion below.
   c. Have fun!