20210608
Update for fw 2.1 release. Summary of changes:
- Add support for the new signal_multiplier config parameter
- Add support for the new 8-bit reflectivity format in simple_viz
- Update Python ouster-sdk package to version 0.2.1, bugfix release
- Remove viz_node and graphics packages from ROS build dependencies
- Ensure ouster_ros dependencies can be satisfied using rosdep
- Various improvements to the ROS img node output
See CHANGELOG.rst for details.