Navigate between menus with keyboard

Please review and test.Actions are not yet handled, only navigation. Also ActionBar support is unimplemented.

If you want to navigate between menus, that don't require exchange(Log/Inventory or Character/Inventory or the same with Powers) close Menu you don't need because by default only first opened menu has focus.
Make sure to update default mod config files when testing and enable NO_MOUSE option shown here:
![keyboard_only](https://f.cloud.github.com/assets/1015344/426235/db5c4cda-adc3-11e2-8b39-d0717c0dfcb4.png)