start of a window title (some property aliasing)
no more need for gui.png, (rather, qml doesn't like full images)

kinda makes things easier in this case anyways. qt 5.2 (which we do not
yet use, does internally spritesheet things anyways so that's cool).

so start splitting skin components into their own image files..

(also, gui.png had a libpng warning for incorrect sRGB color properties.
which could also be seem by 'identify gui.png' this incidentally fixes that)