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This uses GeometrySets to import data from Alembic cache. The main idea
is to easily extend the modifier's capabilities by directly generating
an object of the right type instead of always outputing a Mesh.
This will also make it much easier to use Alembic objects from Geometry
nodes until a Alembic node is available there, and can be considered a
first step to supporting such a node.
For meshes, nothing really changes.
For points, a PointCloud object is generated, which can also be used
inside of Geometry nodes. The radius information is also read now, as
well as arbitrary attributes.
For curves, the CurveEval is directly modified if the data did not
change. Otherwise, we keep the current behavior of modifying the
original Curve object and create a new CurveEval from it.
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