Optionally remove all use of ArrayHandleVirtual
As we remove more and more virtual methods from VTK-m, I expect several users will be interested in completely removing them from the build for several reasons. 1. They may be compiling for hardware that does not support virtual methods. 2. They may need to compile for CUDA but need shared libraries. 3. It should go a bit faster. To enable this, a CMake option named `VTKm_NO_DEPRECATED_VIRTUAL` is added. It defaults to `OFF`. But when it is `ON`, none of the code that both uses virtuals and is deprecated will be built. Currently, only `ArrayHandleVirtual` is deprecated, so the rest of the virtual classes will still be built. As we move forward, more will be removed until all virtual method functionality is removed.
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