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d3d11videosink: Add a property to support rendering statistics data on window

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-dwrite into master

Add a new property "render-stats" to allow rendering statistics data on window for debugging and/or development purpose. Text rendering will be accelerated by GPU since this implementation uses Direct2D/DirectWrite API and Direct3D inter-op for minimal overhead. Specifically, text data will be rendered on swapchain backbuffer directly without any copy/allocation of extra texture.

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