Test cloth mass type switching feature which allows the user to set some particles as static, kinematic, or dynamic.
Renamed SpringClothCollision to SpringClothContact for consistency.
Removed ShiftCenter test for visualizing the effects of external center of mass shifting. This probably must be moved into another folder since might scare the user.
Ordered some test entries such that experiments are the last defined. Those are not actually features of the library and probably must be removed from the testbed into a different project containing experiments.
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