debug : adds DEBUG_ON flag

- if DEBUG_ON is set to true, the console can be opened by
  hitting F5. Otherwise the console cannot be opened by the user.

Change-Id: Icceb8e708cca14ec0d73e4267e5c461ca8961b20
Tuleap: #790

Globals.h

@@ -26,4 +26,5 @@ public enum class ContactStatus {
     READY
 };
 
+constexpr bool DEBUG_ON = false;
 }
\ No newline at end of file

MainPage.xaml.cpp

@@ -107,6 +107,7 @@ MainPage::MainPage()
 void
 MainPage::OnKeyDown(KeyRoutedEventArgs^ e)
 {
+    if (DEBUG_ON)
         if (e->Key == VirtualKey::F5) {
             _outerSplitView_->OpenPaneLength = Window::Current->Bounds.Width;
             _outerSplitView_->IsPaneOpen = !_outerSplitView_->IsPaneOpen;