Move some code into MainWindow and make it internal stuff

That MainWindow uses ProfileList is an internal implementation detail.
The Higher lever Application does not need to know about it.

src/Application.cpp

@@ -37,7 +37,6 @@
 #include <KWindowSystem>
 
 // Konsole
-#include "ProfileList.h"
 #include "SessionManager.h"
 #include "MainWindow.h"
 #include "Session.h"
@@ -73,7 +72,6 @@ void Application::init()
 MainWindow* Application::newMainWindow()
 {
     MainWindow* window = new MainWindow();
-    window->setProfileList(new ProfileList(true, window));
 
     connect(window,
             SIGNAL(newSessionRequest(Profile::Ptr,QString,ViewManager*)),