Identifies colours used in stylesheets.
There is no special magic in the core to perform substitutions on this particular shadow, because they are included using the regular slice mechanism; a stylesheet shadow tiddler says: <html>{ color: [[ColorPalette##PrimaryPale]]; }</html> for example, and the slice mechanism automatically converts it to ''color: #fff'' (assuming there's a line in the [[ColorPalette shadow]] that says '''~PrimaryPale: #fff''.
Link ColorPalette | <<slider chkColorPalette ColorPalette 'view ColorPalette shadow tiddler'>>
