[TypeScript] Settings module (#398)

* Convert settings to TypeScript.

* Simplify loadSettings using await.

* Re-write save feature settings.

* Minor fixes.

src/popup/app/settings/about.component.ts

@@ -0,0 +1,19 @@
+import * as template from './about.component.html';
+
+class AboutController {
+    version: string;
+    year: number;
+    i18n: any;
+
+    constructor(i18nService: any) {
+        this.i18n = i18nService;
+        this.year = (new Date()).getFullYear();
+        this.version = chrome.runtime.getManifest().version;
+    }
+}
+
+export const AboutComponent = {
+    bindings: {},
+    controller: AboutController,
+    template,
+};