Add OSX reference images

TestProjects/PostProcessing/Assets/ReferenceImages/Linear/OSXEditor/Metal/0010_Std_NaN_Killer.png.meta

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TestProjects/PostProcessing/Assets/ReferenceImages/Linear/OSXEditor/Metal/0011_Std_Blending_FloatColor.png.meta

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TestProjects/PostProcessing/Assets/ReferenceImages/Linear/OSXEditor/Metal/0012_Std_Blending_Texture2D.png.meta

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