(Had to initialize is_yuv in the last change because somehow GCC started to complain about it)
-- v2: mfplat/mediatype: Implement MFInitMediaTypeFromMFVideoFormat. mfplat/tests: Add tests for MFInitMediaTypeFromMFVideoFormat. mfplat/mediatype: Stub MFInitMediaTypeFromMFVideoFormat. mfplat/tests: Check the conditions for the MFVideoFlag_BottomUpLinearRep flags. mfplat/mediatype: Append user data in MFCreateMFVideoFormatFromMFMediaType. mfplat/tests: Test that MFCreateMFVideoFormatFromMFMediaType appends user data. mfplat/tests: Test that aperture is dropped with VIDEOINFOHEADER2.