Fixed bug when turning "Share" menubar button off via config, was throwing errors when configured with 
(! share_link) && show_nav && show_tracklist && show_overview
Explicitly setting id for global menus and menu items, for easier access by plugins.
Changed behavior of navbox when searching for a feature by name, now only highlights region for feature if the highlight button has been toggled.
Changed behavior of navbox to highlight location if highlight button toggled and location has start and end.
Reversing a previous attempt to fix bug.
Had removed setting of style.left to fix bug that occurs when ref.start != 0 that leads to no coordinates shown in overview
But, fixed version actually can look worse because coordinates rendered aren't necessarily multiple of 10, 100, etc.
Therefore, put setting of styling.left back in for now