js2ts: install_db.php

- jqValidateForm 구현
  - async-validator + 수작업
- common.js 없이 ventor -> 타겟 ts 직접

hwe/ts/util/setAxiosXMLHttpRequest.ts

@@ -0,0 +1,6 @@
+import axios from "axios";
+
+export function setAxiosXMLHttpRequest(): void{
+    axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';
+    //TODO: X-Requested-With 믿지 말자.
+}