More fullscreen work (now fish cascade basically works in both modes and doesn't crash on mode change).
Also some tidying of UTF8-UTF32 conversion but still messy.
VERSION bumped to 1.6.0 in anticipation of upcoming release



git-svn-id: svn://svn.debian.org/svn/tux4kids/tuxtype/trunk@681 47d30e19-490b-0410-9d18-e851f4e465b3