Fixed issues with the chip list and editable label. Added initial collapsable-region and icon tabs code.

collapsable-region.js

@@ -0,0 +1,47 @@
+import { IgniteElement } from "../ignite-html/ignite-element.js";
+import { IgniteTemplate, div, slot } from "../ignite-html/ignite-template.js";
+
+class CollapsableRegion extends IgniteElement {
+    constructor() {
+        super();
+    }
+
+    get styles() {
+        return `
+            mt-collapsable-region .title:hover {
+                cursor: pointer;
+            }
+        `;
+    }
+
+    get properties() {
+        return {
+            collapse: true,
+            title: "Placeholder"
+        };
+    }
+
+    render() {
+        return this.template.child(
+            new div()
+                .class("title")
+                .onClick(() => this.collapse = !this.collapse)
+                .child(this.title),
+            new div().hide(this.collapse).child(
+                new slot(this)
+            )
+        );
+    }
+}
+
+class CollapsableRegionTemplate extends IgniteTemplate {
+    constructor(...children) {
+        super("mt-collapsable-region", children);
+    }
+}
+
+customElements.define("mt-collapsable-region", CollapsableRegion);
+
+export {
+    CollapsableRegionTemplate as CollapsableRegion
+};