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Make an OpenGL interop library

Kenneth Moreland requested to merge kmorel/vtk-m:interop-lib into master

It has been a while since anyone has really touched the interop library. These changes add a vtkm-interop library that encapsulates all of the code to transfer arrays from VTK-m to OpenGL. The one function, TransferToOpenGL now takes a VariantArrayHandle that passes the array through a library boundary.

The interop library also no longer relies on the VTK-m render library. Chances are if someone is using OpenGL interop they are using their own rendering code.

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