Fixes for release only build of dependencies on windows
Omit blosc packing in deps build
Try to fix patching by reverting to git repos in download steps
Patching does not remove or rename files.
* Add Linux openvdb integration
* Add Mac openvdb integration and enable in ALL
* Create openvdb sandbox to test integration.
* Additional fixes in the patches
* Remove slabasebed sandbox as it has no relevance now
* Provide FindOpenVDB module and fix build issues