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add option to select OSPRay 3 and enable OSP GPU

David E. DeMarle requested to merge demarle/common-superbuild:bump-to-ospray3 into master

Added version 3.1 as a new selectable version and corresponding subdependency version bumps.

When version is 3 or higher, except on Mac, there is a new option to enable OSPRay's GPU support. ISPCRT is a new dependency since OSP 2.11. We build it from from an ISPC source code subdirectory. We propagate the choice to enable GPU down to embree and openVKL and enable all three to be built with DPCPP regardless of the C++ compiler used for the rest of ParaView.

Edited by David E. DeMarle

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