Debugger: UserInterface enhancements.

Add hook to UserInterface to query if Debugger is currently being run
interactively or not. Add corresponding implementations in
{CommandLine,Graphical}UserInterface.

src/apps/debugger/user_interface/gui/GraphicalUserInterface.cpp

@@ -191,6 +191,13 @@ GraphicalUserInterface::Terminate()
 }
 
 
+bool
+GraphicalUserInterface::IsInteractive() const
+{
+	return true;
+}
+
+
 status_t
 GraphicalUserInterface::LoadSettings(const TeamUiSettings* settings)
 {