Typescript migration

* app.js
* main.js
* router.js

server/init.js

@@ -0,0 +1,8 @@
+'use strict';
+
+(function () {
+    // Use graceful-fs instead of fs also in all libraries to have more robust fs handling.
+    const realFs = require('fs');
+    const gracefulFs = require('graceful-fs');
+    gracefulFs.gracefulify(realFs);
+})();