core: Add string property to get current parser context
core: Add string property to get current parser context

GNOME/rygel,jku/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,luisbg/rygel,GNOME/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel