Remove unused dynamic field lookup and redundant utility methods; clean up pubspec dependency paths and update READMEs with detailed package guides.

packages/slider_m3e/lib/src/slider_m3e_widget.dart

@@ -17,5 +17,3 @@ class SliderM3EWidget extends StatelessWidget {
     );
   }
 }
-
-String _pascal(String s) => s.split('_').map((p) => p.isEmpty ? '' : (p[0].toUpperCase() + p.substring(1))).join();