Add HTML5 microdata to the breadcrumbs

[fiammybe]

In order to let search engines find our content, and find the structure of the site, there is a HTML 5 microdata element that can be used in breadcrumbs :

<ul class="p-breadcrumbs " itemtype="https://schema.org/BreadcrumbList" itemscope="">
	<li itemtype="https://schema.org/ListItem" itemscope="" itemprop="itemListElement">
		<a href="https://xenforo.com/" itemprop="item">
			<span itemprop="name">Home</span>
		</a>
		<meta content="1" itemprop="position">
	</li>
	<li itemtype="https://schema.org/ListItem" itemscope="" itemprop="itemListElement">
		<a href="/community/" itemprop="item">
			<span itemprop="name">Forums</span>
		</a>
		<meta content="2" itemprop="position">
	</li>
	<li itemtype="https://schema.org/ListItem" itemscope="" itemprop="itemListElement">
		<a href="/community/.#official-forums.1" itemprop="item">
			<span itemprop="name">Official forums</span>
		</a>
		<meta content="3" itemprop="position">
	</li>
	<li itemtype="https://schema.org/ListItem" itemscope="" itemprop="itemListElement">
		<a href="/community/forums/have-you-seen/" itemprop="item">
			<span itemprop="name">Have you seen...?</span>
		</a>
		<meta content="4" itemprop="position">
	</li>
</ul>

Adding this to the breadcrumb will make it available to all sites using the breadcrumb (and everybody should, to be honest)