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/dotenv/lib/cli-options.js

@@ -0,0 +1,13 @@
+/* @flow */
+
+const re = /^dotenv_config_(encoding|path|debug)=(.+)$/
+
+module.exports = function optionMatcher (args /*: Array<string> */) {
+  return args.reduce(function (acc, cur) {
+    const matches = cur.match(re)
+    if (matches) {
+      acc[matches[1]] = matches[2]
+    }
+    return acc
+  }, {})
+}