Support Uint8ClampedArray

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I want to be able to load and save images using a Uint8ClampedArray. Such array stores the red, green, blue and alpha of each pixel in the image from left to right, then top to bottom. This is similar to how image.bitmap.data works.

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Support passing a Uint8ClampedArray to Jimp.create and add image.getUint8ClampedArray().

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Manually parsing them, adding each pixel one at a time to the image.

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