Remove direct bitcoin calls from qt/bitcoingui.cpp

src/interface/node.cpp

@@ -45,6 +45,7 @@ class NodeImpl : public Node
         Shutdown();
     }
     void startShutdown() override { StartShutdown(); }
+    bool shutdownRequested() override { return ShutdownRequested(); }
     void mapPort(bool use_upnp) override
     {
         if (use_upnp) {
@@ -59,6 +60,14 @@ class NodeImpl : public Node
     {
         return MakeHandler(::uiInterface.InitMessage.connect(fn));
     }
+    std::unique_ptr<Handler> handleMessageBox(MessageBoxFn fn) override
+    {
+        return MakeHandler(::uiInterface.ThreadSafeMessageBox.connect(fn));
+    }
+    std::unique_ptr<Handler> handleQuestion(QuestionFn fn) override
+    {
+        return MakeHandler(::uiInterface.ThreadSafeQuestion.connect(fn));
+    }
 };
 
 } // namespace