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ImageIO Changes for Swift

ImageIO

Modified CGImageMetadataEnumerateTagsUsingBlock(_: CGImageMetadata, _: CFString?, _: CFDictionary?, _: ImageIO.CGImageMetadataTagBlock)
Declaration
From
func CGImageMetadataEnumerateTagsUsingBlock(_ metadata: CGImageMetadata, _ rootPath: CFString?, _ options: CFDictionary?, _ block: ImageIO.CGImageMetadataTagBlock)
To
func CGImageMetadataEnumerateTagsUsingBlock(_ metadata: CGImageMetadata, _ rootPath: CFString?, _ options: CFDictionary?, _ block: @escaping ImageIO.CGImageMetadataTagBlock)