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d3d11decoder: Various cleanup and refactoring

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-dec-cleanup into master 
    d3d11decoder: Refactor device open step and negotiation

    * Remove redundant method arguments
    * Don't allocate staging texture if downstream supports d3d11 memory
    d3d11decoder: Move profile GUID handling into decoder object
    d3d11decoder: Get rid of private struct

    Completely hide member variables
    Revert "d3d11vp9dec: Add support for internal frame resizing"

    This reverts commit 58a4c33a0e4f4e5415d8578166716e0d65c0c27e

    We should use ID3D11VideoProcessor instead of shader
    to avoid copy. We need to revisit this topic later
    d3d11device: Hold ID3D11VideoDevice and ID3D11VideoContext object

    ... instead of QueryInterface-ing per elements. Note that
    ID3D11VideoDevice and ID3D11VideoContext objects might not be available
    if device doesn't support video interface.
    So GstD3D11Device object will create those objects only when requested.

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