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d3d11compositor: Performance optimization

Seungha Yang requested to merge seungha.yang/gstreamer:d3d11compositor-rewrite into main 
    d3d11compositor: Performance optimization

    Removing glvideomixer-like nuance (it was initially referenced)
    and rewriting element since it's not an optimal design at all
    from performance point of view.

    * Remove wrapper bin (and internal conversion/upload/download elements)
      which will waste CPU/GPU resources. Conversion/blending can be done by the
      d3d11compositor element at once.
    * Add support YUV blending without RGB conversion.
      The RGB <-> YUV conversion is completely unnecessary since YUV textures
      support blending as well.
    * Remove complicated blending operation properties since it's hard
      to use from application point of view. Instead, adding "operator" property
      like what compositor element does.
    d3d11converter: Fix alpha factor update

    converter should set entire constant buffer values since it's mapped
    with write-discard flag

Fixes: #1117 (closed)

Edited by Seungha Yang

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