Add PointTransformer which maps points from any coordinate system to another
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schuhschuh commented
Similar to an ImageTransformer, a PointTransformer could decorate an optional SpatialTransform and map points from any coordinate system specified during its construction to another or the same coordinate system. For example, from world to world coordinate, or fixed target image grid indices to moving image grid indices. When no SpatialTransform is given, the identity is assumed and the PointTransform performs the same operation as deepali.core.grid.grid_transform_points().
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