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d3d12: various fixes and enhancements

Seungha Yang requested to merge seungha.yang/gstreamer:fix-d3d12dec-close into main
    d3d12decoder: Release decoder and heap on stop

    Sometimes driver crash happens if ID3D12VideoDevice got closed first,
    and then ID3D12VideoDecoderHeap/ID3D12VideoDecoder are released.
    d3d12videosink: Fix crash on set_buffer()

    set_buffer() can be called with null buffer
    d3d12: Fix warnings reported by debug layer

    Fixing below debug layer report
    ID3D12Device::CreateCommittedResource: Ignoring InitialState D3D12_RESOURCE_STATE_COPY_DEST.
    Buffers are effectively created in state D3D12_RESOURCE_STATE_COMMON.

    Buffer resource will be automatically promoted to D3D12_RESOURCE_STATE_COPY_DEST
    at the very first COPY operation time.
    d3d12: Simplify fence data setup

    Adding COM and GstMiniObject specific methods to skip passing
    free function pointer
    d3d12device: Print live objects on finalize()

    The report from debug layer can help tracing resource leak
Edited by Seungha Yang

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