* setup menu as a render prop sent down from PanelStateWrapper to PanelChrome
* let the Dropdown take care of opening the menu in PanelChrome
* menu and leftItems are on the right side of the header together
* add storybook examples with menu
* menu does not need to be a callback because it's opened in a Dropdown anyway
* pass down to getPanelMenu whether or not data is streaming atm
* stop loading data as well as streaming from menu
* override menu's style where needed
* reduce snapshot matching in tests
* Add landmark markup
* Make panel titles h2
* Descibe panel landmarks
* Add nav elements and heading 1
* Reset line height and remove margin
* Make focus styles visible
* Change nav to section
* Add desc
* Fix focus styles cutoff
