Allow Image to optionally have alt text specified

snippetrequested to merge
topic/3.0/image_alt_text into branch/3.1

Optionally allow Image(img) to be called with Image(img, 'this is alt text') which would set 'this alt text' on an image. Adds a description property to the Image class which stores the alt text. Should close #1850 (closed) --HG-- branch : 3.0

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