Started refactor and alignment of component system

- Updates old components to newer format, removes legacy component
support.
- Makes component registration easier and less duplicated.
- Adds base component class to extend for better editor support.
- Aligns global window exposure usage and aligns with other service
  names.

resources/js/components/page-display.js

@@ -22,7 +22,7 @@ class PageDisplay {
         if (sidebarPageNav) {
             DOM.onChildEvent(sidebarPageNav, 'a', 'click', (event, child) => {
                 event.preventDefault();
-                window.components['tri-layout'][0].showContent();
+                window.$components.first('tri-layout').showContent();
                 const contentId = child.getAttribute('href').substr(1);
                 this.goToText(contentId);
                 window.history.pushState(null, null, '#' + contentId);