Added colour gradients and updated text
Added a note that this glyphset is not actually in use
Added a warn that I use a lot (currently commented out)
Added a bit of optional breathing space to plain text tracks (e.g. image footers)
Added extra space above 'missing' message, to ensure clear separation from legends
Improved whitespace on Region in Detail legends
Extended _icon_scale to allow configuration (number of boxes, labels/no labels)
Added configuration options for gradient