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/autoprefixer/lib/hacks/background-clip.js

@@ -0,0 +1,24 @@
+let Declaration = require('../declaration')
+let utils = require('../utils')
+
+class BackgroundClip extends Declaration {
+  constructor(name, prefixes, all) {
+    super(name, prefixes, all)
+
+    if (this.prefixes) {
+      this.prefixes = utils.uniq(
+        this.prefixes.map(i => {
+          return i === '-ms-' ? '-webkit-' : i
+        })
+      )
+    }
+  }
+
+  check(decl) {
+    return decl.value.toLowerCase() === 'text'
+  }
+}
+
+BackgroundClip.names = ['background-clip']
+
+module.exports = BackgroundClip