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/attachments.js

@@ -1,10 +1,7 @@
-/**
- * Attachments
- * @extends {Component}
- */
 import {showLoading} from "../services/dom";
+import {Component} from "./component";
 
-class Attachments {
+export class Attachments extends Component {
 
     setup() {
         this.container = this.$el;
@@ -49,7 +46,7 @@ class Attachments {
         this.mainTabs.components.tabs.show('items');
         window.$http.get(`/attachments/get/page/${this.pageId}`).then(resp => {
             this.list.innerHTML = resp.data;
-            window.components.init(this.list);
+            window.$components.init(this.list);
         });
     }
 
@@ -66,7 +63,7 @@ class Attachments {
         showLoading(this.editContainer);
         const resp = await window.$http.get(`/attachments/edit/${id}`);
         this.editContainer.innerHTML = resp.data;
-        window.components.init(this.editContainer);
+        window.$components.init(this.editContainer);
     }
 
     stopEdit() {