Add a custom menu that can be configured through admin and displayed by themes

The idea here is to integrate the static drop down menu that is popular with themer's into Moodle core.

The custom menu should be implemented using the YUI3 node-menunav widget and should display (even possibly work) with JavaScript enabled or disabled.
It should be implemented through the renderer as well in order to be over-rideable encase someone would like to implement a pure CSS drop down or any other sort of drop down that is desired.
This should also be supported in the standard theme.