Merge pull request #211 from Unity-Technologies/zgh/change_class_type

change class  protection level

com.unity.uiwidgets/Runtime/widgets/actions.cs

     
 
     
-    class CallbackAction : UiWidgetAction  {
+    public class CallbackAction : UiWidgetAction  {
         public CallbackAction(LocalKey intentKey, OnInvokeCallback onInvoke) : base(intentKey: intentKey) {
             D.assert(onInvoke != null);
             this.onInvoke = onInvoke;
     }
 
     
-    class ActionDispatcher : Diagnosticable {
+    public class ActionDispatcher : Diagnosticable {
         public ActionDispatcher() {
         }
 
         }
     }
 
-    class Actions : InheritedWidget {
+    public class Actions : InheritedWidget {
         public Actions(
             Key key = null,
             ActionDispatcher dispatcher = null,