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Add LoadTextureFromTexture function
The D3DX11LoadTextureFromTexture can be used to copy from one D3D11 texture to another starting with a specific source/dest box/rect, mip level, array element, num elements. It performs necessary conversions.
DirectXTex can be used to implement something like this using CopyRectangle, but it would be useful and informative to have a more full-featured LoadTextureFromTexture in the DirectXTex library.