Rigid-body-motion

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Bug fixes & improvements
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* Fixed package installation through pip (version 0.9.0 is no longer available).

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Breaking changes
~~~~~~~~~~~~~~~~

* Dropped support for Python 3.6.

Bug fixes & improvements
~~~~~~~~~~~~~~~~~~~~~~~~

* Fixed issue with matplotlib versions >= 3.5.

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New features
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* New ``ros.init_node`` method to initialize a ROS node and optionally start
a ROS master.


Bug fixes & improvements
~~~~~~~~~~~~~~~~~~~~~~~~
* All ROS dependencies are now lazily imported.

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New features
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* New ``from_euler_angles`` utility method.


Bug fixes & improvements
~~~~~~~~~~~~~~~~~~~~~~~~

* Importing ROS interface classes will not fail silently anymore and instead
show the traceback of the import error.

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Breaking changes
~~~~~~~~~~~~~~~~

* Example data is now fetched via the ``pooch`` library and no longer a part
of the package itself.

New features
~~~~~~~~~~~~

* New ``io`` module for import/export methods.
* New ``ros.RosbagWriter`` class for writing rosbag files.

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Breaking changes
~~~~~~~~~~~~~~~~

* Top-level reference frame transform and lookup methods now all accept a
``return_timestamps`` argument that is ``False`` by default. Previously,
methods would return timestamps only if the result of the transformation was
timestamped. This does not affect the xarray interface.
* ``lookup_transform`` now returns the correct transformation from the base
frame to the target frame (instead of the other way around).
* ``ReferenceFrame.get_transformation`` is deprecated and replaced by
``ReferenceFrame.lookup_transform``.

New features
~~~~~~~~~~~~

* New ``plot`` module with plotting methods for static reference frames and
arrays of points, quaternions and vectors.
* New ``lookup_pose`` method that calculates the pose of a frame wrt another.

Bug fixes & improvements
~~~~~~~~~~~~~~~~~~~~~~~~

* Fixed ``"reference_frame"`` attribute incorrectly set by
``transform_vectors``.