Fixed the image object to act more like a true input. If an image has a
label, it will show a thumbnail along with image info, and users can
right-click to get upload/download options. If there's no label, then
the image is shown full-size as before, so it acts like a decoration.
Changed binary string values to look like the image, with an icon representing
binary data and an info string showing info about the data type. This is
a little nicer than the hex dump we used to show for binary strings. String
size can be set to "binary" to force the string into the binary display
mode.
