windows: use WiX to make MSI installers

Ben Boeckelrequested to merge
ben.boeckel/paraview-superbuild:windows-use-wix into master

WiX makes .msi installers. This drops nsis and makes .exe installers no longer available.

Required for !1000 (merged) due to long paths not being supported by NSIS.

Cc: @mwestphal @cory.quammen @wascott

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