Feature/cfi_cad_engine
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This adds a full new CAD back end to the nekmeshutils CAD system from CFI (CADfix). There are also some small updates to the data structures of the CAD system which have been propagated through the code. CADfix 12, which will be released soon, will have some better facilities to build with nekmesh + cmake, for now that part is a bit of a hack but it works.