[graphviz-interest] Support data: URI for embedded images

Would it be reasonable to support the data: URI for images in Graphviz?

In modern web browsers, you can use a data: URI to include an image inline and avoid the extra HTTP request, e.g.:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==">

This is described further here:

http://en.wikipedia.org/wiki/Data_URI_scheme

It would be neat if the same could be done in Graphviz, e.g.:

graph {
  a [image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="]
}

Sometimes it's more convenient to be able to describe everything about the graph, including its images, in a single file.

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