Function printNestedItemsList

Prints the nested list for pages and categories

Package: plugins\zenpage
Author: Malte Müller (acrylian), Stephen Billard (sbillard)
Located at zp-extensions/zenpage/zenpage-admin-functions.php

Parameters summary
`string`	`$listtype = 'cats-sortablelist'`	<p>'cats-checkboxlist' for a fake nested checkbock list of categories for the news article edit/add page 'cats-sortablelist' for a sortable nested list of categories for the admin categories page 'pages-sortablelist' for a sortable nested list of pages for the admin pages page</p>
`integer`	`$articleid = ''`	Only for $listtype = 'cats-checkboxlist': For ID of the news article if the categories an existing articles is assigned to shall be shown, empty if this is a new article to be added.
`string`	`$option = ''`	Only for $listtype = 'cats-checkboxlist': "all" to show all categories if creating a new article without categories assigned, empty if editing an existing article that already has categories assigned.
	`$class = 'nestedItem'`

Return value summary
`string`	\| bool