vf_d3d11vpp: add a D3D11 video processor filter

Main use: deinterlacing.

I'm not sure how to select the deinterlacing mode at all. You can
enumate the available video processors, but at least on Intel, all of
them either signal support for all deinterlacers, or none (the latter is
apparently used for IVTC). I haven't found anything that actually tells
the processor _which_ algorithm to use.

Another strange detail is how to select top/bottom fields and field
dominance. At least I'm getting quite similar results to vavpp on Linux,
so I'm content with it for now.

Future plans include removing the D3D11 video processor use from the
ANGLE interop code.

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