ExternalData: remove MIDAS support
It's going away.
See also: vtk/vtk!3858 (closed)
Cc: @shawn.waldon @utkarsh.ayachit @brad.king @cory-quammen
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It's going away.
See also: vtk/vtk!3858 (closed)
Cc: @shawn.waldon @utkarsh.ayachit @brad.king @cory-quammen