Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/asynckit/serial.js

@@ -0,0 +1,17 @@
+var serialOrdered = require('./serialOrdered.js');
+
+// Public API
+module.exports = serial;
+
+/**
+ * Runs iterator over provided array elements in series
+ *
+ * @param   {array|object} list - array or object (named list) to iterate over
+ * @param   {function} iterator - iterator to run
+ * @param   {function} callback - invoked when all elements processed
+ * @returns {function} - jobs terminator
+ */
+function serial(list, iterator, callback)
+{
+  return serialOrdered(list, iterator, null, callback);
+}