COMP: Add DWIConvert as a CLI Module

Sam Horvathrequested to merge
github/fork/Chaircrusher/AddDWIConvert into master

Created by: Chaircrusher

DWIConvert is a compatible replacement for DicomToNrrdConverter. This patch uses CMake's ExternalProject to download the source code from

https://github.com/Chaircrusher/NewDicomToNrrdConverter

and build it as part of the Modules/CLI build.

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