Ubuntu 20.04 with Python3 & ROS Noetic/ROS2 Galactic Install

[hello-binit]

TODO:

• Enable respeaker firmware flashing
• Update meshes for Stretch ROS2
• stretch_calibration for ROS2
• compile FUNMAP cython for ROS2
• scan_tools for ROS2
• Gazebo or Ignition for ROS2
• calibrated URDF copying for ROS2
• move all ros-noetic-/ros-galactic- installs to rosdep
  • move python dependencies to rosdep as well (e.g. numpy)
• ros_numpy not available for ROS2 galactic
• Conflict between ROS Noetic and ROS2 Galactic prevents rosdep from installing some deps
  • Need to unsource noetic before rosdep will install galactic deps
• Unable to locate following ROS2 packages:
  • ros-galactic-rviz-imu-plugin
  • ros-galactic-imu-filter-madgwick
  • ros-galactic-rgbd-launch
  • ros-galactic-move-base
  • ros-galactic-move-base-msgs
  • ros-galactic-gmapping
  • ros-galactic-navigation
• Error when building Noetic workspace with Galactic also present
• Decouple arduino-cli from being reliant on 'hello-robot' user (or just delete arduino-cli install bc RE1_firmware_updater handles).
• re-enabled startup jingle in 20.04
• rosdep2 for ros2?