[add-art dev] Image download code

[Ethan Ham]

Hi all,

I decided to take a stab at coding image download (via xml).  Here's what I
put together.  I was a little hesitant about sticking it into the
development code without a nod from someone... If you want I could go ahead
and do that, or someone else who is more familiar with the code base is
welcome to insert what I've put together.

The .js file has a variable for setting the name of the extension and for
identifying the location of the xml file.

The xml file has artist & title info (which I'm not doing anything with),
the filename that the image should be saved under, and the image data
(converted to Base64).

I don't have any logic here for establishing when new images should be
downloaded... This code simply does the download whenever it is run.

Best,
Ethan

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