[view] DataView: add onDataAction signal

src/main/haxework/view/data/DataView.hx

@@ -15,6 +15,7 @@ class DataView<D, V:IView<Dynamic>> extends GroupView {
     public var factory(default, set):Factory<D, V>;
     public var onItemSelect(default, null):Signal3<Int, D, V> = new Signal3();
     public var onDataSelect(default, null):Signal<D> = new Signal();
+    public var onDataAction(default, null):Signal2<D, String> = new Signal2();
     public var dataViews(default, null):Array<V>;
 
     private var objectIndexes:Map<DisplayObject, Int> = new Map();