Add example WSGI DAV directory list.

examples/wsgidav-directory-list/TODO

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+# TODO
+
+[ ] Have this generated with the rest of the examples.

examples/wsgidav-directory-list/template.html

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+<script type="text/javascript">["/:dir_browser/style-min.css","/:dir_browser/webdav-min.js"].forEach((function(e,s){/css$/.test(e)?((s=document.createElement("link")).href=e,s.rel="stylesheet"):(s=document.createElement("script")).src=e,document.head.appendChild(s)}));
+</script><!--

examples/wsgidav-directory-list/wsgidav.yaml

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+dir_browser:
+    htdocs_path: .