Also made changes in FastParser impl. to emit this event. I've made use
of existing namespace and element name strings to store target
and data for this event.

Change-Id: I6f00cd1172552dd9a74ec22190bef3d2289ae515
Reviewed-on: https://gerrit.libreoffice.org/38784Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>