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/adjust-sourcemap-loader/codec/output-root-relative.js

@@ -0,0 +1,37 @@
+'use strict';
+
+var relative = require('./output-relative');
+
+/**
+ * Codec for relative paths with respect to the output directory.
+ * @type {{name:string, decode: function, encode: function, root: function}}
+ */
+module.exports = {
+  name  : 'outputRootRelative',
+  decode: decode,
+  encode: encode,
+  root  : relative.root
+};
+
+/**
+ * Decode the given uri.
+ * Any path with leading slash is tested against output directory.
+ * @this {{options: object}} A loader or compilation
+ * @param {string} uri A source uri to decode
+ * @returns {boolean|string} False where unmatched else the decoded path
+ */
+function decode(uri) {
+  /* jshint validthis:true */
+  return uri.startsWith('/') && relative.decode.call(this, uri.slice(1));
+}
+
+/**
+ * Encode the given file path.
+ * @this {{options: object}} A loader or compilation
+ * @param {string} absolute An absolute file path to encode
+ * @returns {string} A uri with leading slash
+ */
+function encode(absolute) {
+  /* jshint validthis:true */
+  return '/' + relative.encode.call(this, absolute);
+}