Preview

A small preview of Zukitre that is a continuation of Zukitwo. I want it to be a bit more flat with less gradients and sharpness. Titlebar buttons will probably change unless I can force everyone to set their title font-size to 10 or set the titlebar to a fixed size (which is impossible). So maybe I'll just go back to use the same round ones that I use for Zukitwo/Zukiwi.