feat(TransformControlsWidget): add select in example

fix(ViewStream): handle unmount during image decode

fix(Mapper): add BigInt support in Mapper and Mapper2D

feat(CleanPolyData): add vtkCleanPolyData

docs(examples): add TransformControls link

fix(interactorstylemprslice): fix getSliceRange when input image has …

…orientation matrix

getBounds() rotates the extent, however it produces new corner points. Those new corner points were
used to compute the slice range along the slice normal . Instead we keep the original extent corner
points to apply the image direction along the slice normal.

fix(ImageData): More accurate update events for transforms

refactor(cell): cleanup vtkCell bounds usage

Expose a convenient vtkBoundingBox::getDiagonalLength2() function

feat(MergePoint): add vtkMergePoints

feat(Planes): add vtkPlanes