Wt

Idea from geert:

1. A tree-like navigation model where each leaf has an internal path (basically this could be WAbstractItemModel)
2. A simple controller that couples internal paths to the state of WStackedWidget
3. The possibility to define a menu for each level in the navigation model:

Example:

• A level 1 menu: toplevel toolbar
• A level 2 menu: buttons links
• A level 3 menu: popupmenu associated with level 2 menu buttons
• An extra visualization of level 2 menu organized by level 1 column as a footer