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returns a handle of the newly created group
After a new group is created, polygons can be associated with this group
by calling STATE_polygon_set_group()
IMPORTANT: if the polygons that are associated with the group are not part of the
world (after creating a new polygon, we can add it to the world by calling STATE_engine_add_polygon() )
most of the function in the group API wont work for those polygons.
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