* Switches to always focusing the first menu item, even when opening by mouse. The focus styling will only apply when focused by keyboard.
* Adds the ability to set the focus origin through the `FocusKeyManager`.
Fixes#9252.
This also required creating a module file for every component because
the max re-export can't be in the same file as the module definition or
else ngc will *only* export the alias.
Jeremy Elbourn