Narrowed down includes to improve compile time

apps/launcher/datafilespage.cpp

@@ -1,6 +1,9 @@
 #include "datafilespage.hpp"
 
-#include <QtGui>
+#include <QPushButton>
+#include <QMessageBox>
+#include <QCheckBox>
+#include <QMenu>
 
 #include <components/files/configurationmanager.hpp>
 

apps/launcher/graphicspage.cpp

@@ -1,6 +1,8 @@
 #include "graphicspage.hpp"
 
-#include <QtGui>
+#include <QDesktopWidget>
+#include <QMessageBox>
+#include <QDir>
 
 #include <cstdlib>
 

apps/launcher/maindialog.cpp

@@ -1,6 +1,13 @@
 #include "maindialog.hpp"
 
-#include <QtGui>
+#include <QFontDatabase>
+#include <QInputDialog>
+#include <QFileDialog>
+#include <QCloseEvent>
+#include <QTextCodec>
+#include <QProcess>
+#include <QFile>
+#include <QDir>
 
 #include "utils/checkablemessagebox.hpp"
 

apps/launcher/playpage.cpp

@@ -1,6 +1,10 @@
 #include "playpage.hpp"
 
-#include <QtGui>
+#include <QListView>
+
+#ifdef Q_OS_MAC
+#include <QPlastiqueStyle>
+#endif
 
 PlayPage::PlayPage(QWidget *parent) : QWidget(parent)
 {