* Moved the layer visibility and transparency, from instancerenderer.cpp to layercache.cpp and improved it. Note: Now you can set a instance completely opaque, when their layer is fully transparent or reverse. If both have a transparent value then the result from layer-instance is used.

* Graphics and input objects for DirectX.

* Add an image of each widget to the documentation
* Make gcn::TabbedArea resize the contents to the area inside the tab