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A NULL group_handle means the whole world
moves all the vertex belonging to the group. The result is that the
center of mass also moves with the given step
space flag could be: CAMERA_SPACE, OBJECT_SPACE, WORLD_SPACE
Note that this function does not update the rotation center of the group
This means that if you use STATE_group_rotate() after moving the group
the rotation center will stay as before. See also STATE_group_set_rotate_reference_point()
STATE_group_get_rotate_reference_point()
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