* Initial stab at Tab/Enter key handlers for Slots - Added tabIndex="0" attribute for the Slot sections and for the <li> elements inside.
* Set up refs for slot <li> elements to allow focus manipulation.
* Added initial keyDown handlers for Enter and Tab keys.
* Additional update for focus handling inside slot selection <ul>
* Added Tab/Enter/Shift-Tab key handlers for Outfitting section. Needs some fine-tuning but is usable in current state
* Added keydown handler for Empty module selection. ToDo: handlers for engineering sections
* Cleanup
* Update to add focus on Modifications icon and Enter key handler to open modifications menu
* Updates to add keydown handlers for modifications menu, and tab/shift-tab/enter key handlers while mod menus are open.
* Additional updates for keyDown handlers
* Update to add tabindex=0 and Enter Key handling for specials menus. ToDo: keep focus inside specials menu until item is selected with Enter key.
* Further updates for keyDown handler in Modifications menus.
* Added keyDown handlers to full mod menu (when mod menu is opened and a mod has been previously selected)
* Update to add shift-tab and tab focus handling for number editor fields
* Additional tab/shift-tab handlers. Fixed bug with exp. effects being recaculated for every onBlur event.
* Added check to bypass focus reset if change in component was due to change in modification value.
* Additional updates to tab/shift-tab handlers for modifications menu.
* more updates
* "Final" updates and bug fixes - added code for cases where there were no specials.
* Final updates to set focus to appropriate element when slot/mod menus are closed.
