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/clean-css/lib/options/rebase.js

@@ -0,0 +1,10 @@
+function rebaseFrom(rebaseOption, rebaseToOption) {
+  if (undefined !== rebaseToOption) {
+    return true;
+  } if (undefined === rebaseOption) {
+    return false;
+  }
+  return !!rebaseOption;
+}
+
+module.exports = rebaseFrom;