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d3d11: Various code cleanup

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-cleanup into master 
    d3d11: Privatize d3d11memory implementation

    Hide most of symbols of GstD3D11Memory object.
    GstD3D11Memory is one of primary resource for imcoming d3d11 library
    and it's expected to be a extensible feature.
    Hiding implementation detail would be helpful for later use case.

    Summary of this commit:
    * Now all native Direct3D11 resources are private of GstD3D11Memory.
      To access native resources, getter methods need to be used
      or generic map (e.g., gst_memory_map) API should be called
      apart from some exceptional case such as d3d11decoder case.
    * Various helper methods are added for GstBuffer related operations
      and in order to remove duplicated code.
    d3d11: Add a helper method for d3d11buffferpool setup

    Remove duplicated code for d3d11buffferpool setup.
    d3d11device: Remove optional helper methods

    Most of Direct3D11 APIs can be called without GstD3D11Device
    abstraction. This is a part of prework for public GstD3D11 library
    to introduce minimal APIs

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