Py-trees

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* [announce] python3 only support from this point forward
* [announce] now compatible for ros2 projects

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* [formatter] reformat auto-generated resources.py
* [linter] 2 lines between methods
* [readme] fix preview instructions, elucidate non-nvidia alternatives
* [vscode] devcontainer DISPLAY fix
* Contributors: Daniel Stonier

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* [actions] pre-merge and update-cache, `146 <https://github.com/splintered-reality/py_trees_js/pull/146>`_
* [actions] push containers, `144 <https://github.com/splintered-reality/py_trees_js/pull/144>`_
* [poetry] update project to use poetry, `143 <https://github.com/splintered-reality/py_trees_js/pull/143>`_
* [vscode] devcontainer workflows, `143 <https://github.com/splintered-reality/py_trees_js/pull/143>`_
* [tests] basic tests, formatting, linting, `143 <https://github.com/splintered-reality/py_trees_js/pull/143>`_

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* [js] remove buggy early view update and optimise them, `142 <https://github.com/splintered-reality/py_trees_js/pull/142>`_

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* [js] bugfix accidentally ignored tree_cache size, `123 <https://github.com/splintered-reality/py_trees_js/pull/123>`_
* ... missed a few pull requests inbetween

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* [bugfix] oneshot no longer permanently modifies the original class