Application launcher enhancements

[rachael-phillips]

This is a React implementation follow-up to Core issue patternfly/patternfly#2365. This React issue is on hold until patternfly/patternfly#2365 has been closed.

[mcoker]

patternfly/patternfly#2428 is merged

• Creates a new element .pf-c-app-launcher__menu-search to hold the text input form control for searching the menu.
• Creates a new element .pf-c-app-launcher__menu-wrapper to be used as the list item that will wrap the item link and button inside when used with a favorites menu. Technically this could be used outside of the context of favorites in the future if we wanted to have more actions beside a link in an app launcher that do other things. This is just a way to establish a list item that will then take a link and action(s).
  • This gets the class .pf-m-favorite when an item in the list has been favorited.
• Creates a variation for .pf-c-app-launcher__menu-item called .pf-m-link that serves as the link inside .pf-c-app-launcher__menu-wrapper
• Creates a variation for .pf-c-app-launcher__menu-item called .pf-m-action that serves as an action inside .pf-c-app-launcher__menu-wrapper. Technically this could be anything, not just a favorite button. And I suppose you could have more than 1.