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DDS files that specify DDS_PITCH load more reliably #81

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- Some files define Pitch instead of LinearSize
- The files sometimes also have RGBBitCount
- However, many do not, such as those in the NVTT test suite
-- https://github.com/castano/nvidia-texture-tools/blob/master/data/testsuite/lightmap/cottage.dds
- In other cases, DX10 formats more fully specify the data.
- In cases where we have no better path, use dwPitchOrLinearSize as pitch
-- Microsoft recommends recomputing pitch instead
-- https://docs.microsoft.com/en-us/windows/desktop/direct3ddds/dx-graphics-dds-pguide
-- However, had no convenient way to select correct method
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