Create a list of settings for an image.
amImage(href, width, height, opacity = 1)a link to an image file or a base64 string representing an
image; you can get such a string with tinyIcon, or
you can create it from a file with base64enc::dataURI; this option
can also be a string of the form "inData:DATAFIELD" where
DATAFIELD is the name of a column of the data - this is useful to
have different images in the bullets
dimensions of the image
opacity of the image, a number between 0 and 1
A list of settings for an image.