Step 3 sender and reply to per newsletter

- added sender_address/sender_name/reply_to_address/reply_to_name
- added validation on all form fields (except checkbox and radio)

assets/js/src/form/fields/selection.jsx

@@ -123,6 +123,7 @@ function(
           placeholder={ this.props.field.placeholder }
           multiple={ this.props.field.multiple }
           defaultValue={ default_value }
+          {...this.props.field.validation}
         >{ options }</select>
       );
     }