rename app.js to legacy.js, move globals to app.js in Sms object and helpers to a dedicated file

js/devel/helpers.js

@@ -0,0 +1,29 @@
+/**
+ * Nextcloud - Phone Sync
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Loic Blot <loic.blot@unix-experience.fr>
+ * @copyright Loic Blot 2014-2017
+ */
+
+function inArray(val, arr) {
+	return ($.inArray(val, arr) !== -1);
+}
+
+function arrayUnique(arr) {
+	return arr.filter(function (item, i, arr) {
+		return i === arr.indexOf(item);
+	});
+}
+
+function toBool(str) {
+	if (str === "true") {
+		return true;
+	}
+	else if (str === "false") {
+		return false;
+	}
+	return null;
+}