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/dropdown.js

@@ -74,7 +74,7 @@ class DropDown {
     }
 
     hideAll() {
-        for (let dropdown of window.components.dropdown) {
+        for (let dropdown of window.$components.get('dropdown')) {
             dropdown.hide();
         }
     }