migrate @umbraco-cms/controller to libs

src/Umbraco.Web.UI.Client/libs/controller/controller.class.ts

@@ -0,0 +1,27 @@
+import { UmbControllerHostInterface } from './controller-host.mixin';
+import { UmbControllerInterface } from './controller.interface';
+
+export abstract class UmbController implements UmbControllerInterface {
+	protected host?: UmbControllerHostInterface;
+
+	private _alias?: string;
+	public get unique() {
+		return this._alias;
+	}
+
+	constructor(host: UmbControllerHostInterface, alias?: string) {
+		this.host = host;
+		this._alias = alias;
+		this.host.addController(this);
+	}
+
+	abstract hostConnected(): void;
+	abstract hostDisconnected(): void;
+
+	public destroy() {
+		if (this.host) {
+			this.host.removeController(this);
+		}
+		delete this.host;
+	}
+}