Converts an abstract description of a layout's children into a list of the children's geometry objects.
The generic function
interpret-description
translates an abstract description of the
layout
's children into a list of those children's geometry objects.
For example, column-layout expects as its description a list of items where each item in the list is either the slot-name of the child or a string which should be turned into a title pane. This is the default handling of a layout's description, which is done by calling the generic function parse-layout-descriptor to do the translation for each item.