* Assembly: Change Joint References to remove cyclic dependency.
* Update JointObject.py
* Update TestCore.py
* Update JointObject.py
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Update AssemblyUtils.cpp
* Update UtilsAssembly.py
* Update JointObject.py
* small fix for link groups
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