Replace Connect() with Bind() in all samples and utils too

Still use Connect() in unit tests which were written explicitly for it
and in EventConnector, which can't use Bind() as it uses a variable for
the event type.

No real changes, just use the newer and more convenient function.

samples/mdi/mdi.cpp

@@ -220,14 +220,14 @@ MyFrame::MyFrame()
 #endif // wxUSE_ACCEL
 
     // connect it only now, after creating m_textWindow
-    Connect(wxEVT_SIZE, wxSizeEventHandler(MyFrame::OnSize));
+    Bind(wxEVT_SIZE, &MyFrame::OnSize, this);
 }
 
 MyFrame::~MyFrame()
 {
     // and disconnect it to prevent accessing already deleted m_textWindow in
     // the size event handler if it's called during destruction
-    Disconnect(wxEVT_SIZE, wxSizeEventHandler(MyFrame::OnSize));
+    Unbind(wxEVT_SIZE, &MyFrame::OnSize, this);
 
     // also prevent its use as log target
     delete wxLog::SetActiveTarget(NULL);