Dm-robotics-panda

What's Changed
* Fix Python package dependencies: there was a special case when some `dm_robotics` packages were not updated
* Fix HMTL error in README.md

What's Changed
* Move to radian/quat description by JeanElsner in https://github.com/JeanElsner/dm_robotics_panda/pull/4
* Custom gripper interface and tutorial section by JeanElsner in https://github.com/JeanElsner/dm_robotics_panda/pull/5


**Full Changelog**: https://github.com/JeanElsner/dm_robotics_panda/compare/v0.3.3...v0.4.0

* Fixed a bug where the visualization app would attempt to plot multidimensional observations and crash
* Added interfaces to add extra effectors, scene initializers to PandaEnvironment
* The robots added by PandaEnvironment can now be accessed through an ordered dictionary property where the keys are the robots' configured names

Fixes a bug where added props were missing a reference to their freejoint which in turn lead to props not reporting their proper pose in world frame.

Small bugfix in the instantiation of hardware for HIL.