fix #3067: ui: add a separate notes view for longer markdown notes

since markdown notes might be rather long, this commit adds a tab
similar to pve's datacenter or node notes. requires a bump of the
widget toolkit in order to use the `pmxNotesView`.

Signed-off-by: Stefan Sterz <s.sterz@proxmox.com>

www/NavigationTree.js

@@ -32,6 +32,12 @@ Ext.define('PBS.store.NavigationStore', {
 		path: 'pbsDashboard',
 		leaf: true,
 	    },
+	    {
+		text: gettext('Notes'),
+		iconCls: 'fa fa-sticky-note-o',
+		path: 'pbsNodeNotes',
+		leaf: true,
+	    },
 	    {
 		text: gettext('Configuration'),
 		iconCls: 'fa fa-gears',