Added the WidgetID data class for better organization.

Author: Dev-iL

WidgetID.m

@@ -0,0 +1,17 @@
+classdef WidgetID < handle
+  % A data class for storing identifying information about JS widgets in UIFigures.
+
+  properties (GetAccess = public, SetAccess = public)
+    ID_attr char
+    ID_val char
+  end
+  
+  methods
+    % Counstructor:
+    function obj = WidgetID(identifyingAttributeName, identifyingAttributeValue)
+      obj.ID_attr = identifyingAttributeName;
+      obj.ID_val  = identifyingAttributeValue;
+    end    
+  end
+  
+end