demo: upload message_dialog.hsp
tutorial: upload pngs
demo: update app_1.hsp
demo: update hbox_pack.hsp
demo: update libgobject-2.0-0.as
demo: update libgtk-3-0.as
tutorial: update 8-1.hsp
tutorial: upload 8-2.hsp
tutorial: upload 8-4.hsp
tutorial: upload 8-5.hsp
tutorial: upload 8-6.hsp
tutorial: update tutorial text