Add utility for if in play mode that returns true for shipped applications.

Source/Engine/Engine/Engine.cpp

@@ -442,6 +442,15 @@ bool Engine::IsEditor()
 #endif
 }
 
+bool Engine::IsPlayMode()
+{
+#if USE_EDITOR
+    return Editor::IsPlayMode;
+#else
+    return true;
+#endif
+}
+
 int32 Engine::GetFramesPerSecond()
 {
     return EngineImpl::Fps;

Source/Engine/Engine/Engine.h

@@ -178,6 +178,11 @@ public:
     /// </summary>
     API_PROPERTY() static bool IsEditor();
 
+    /// <summary>
+    /// Returns whether the editor is in play mode or will always return true in a shipped applications.
+    /// </summary>
+    API_PROPERTY() static bool IsPlayMode();
+
     /// <summary>
     /// Gets the amount of frames rendered during last second known as Frames Per Second. User scripts updates or fixed updates for physics may run at a different frequency than scene rendering. Use this property to get an accurate amount of frames rendered during the last second.
     /// </summary>