Add the possibility to ignore pinned pages when sorting document tree macro results

Mohamed Boussaa the document tree takes into account the pinned pages using a filter, see https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-index/xwiki-platform-index-tree/xwiki-platform-index-tree-war/src/main/webapp/templates/documentTree_macros.vm#L27 . The filters parameter is currently not exposed in the rendering macro, but can be used with the Velocity macro.