demo: rename demo1.hsp -> app_1.hsp
tutorial: update 5-2.hsp
tutorial: update 5-2.hsp
tutorial: upload window capture pngs
demo: update libgtk-3-0.as
tutorial: udpate 5-2.hsp and 5-2.png
tutorial: update 7.hsp
tutorial: update 8-1.hsp
tutorial: update tutorial text