More widgets

I have created two new widgets, a scroll bar and a progress bar. The bar can be dragged and a click on the arrows moves the bar by an specified amount (just the usual behaviour). The intersection test is somehow inaccurate for the right arrow, seems to be an issue with the ray/OBB test.

The widgets are both coloured like the buttons (a bit boring, I know ;) ). The example shows a scroll bar connected to a progress bar.