Remove unused includes

src/engine/piecevisuals.cpp

@@ -12,7 +12,6 @@
 #include "palapeli_debug.h"
 #include <QImage>
 #include <QPainter>
-#include <QtMath>
 
 //BEGIN shadow blur algorithm
 

src/engine/view.cpp

@@ -17,7 +17,6 @@
 #include <KLocalizedString>
 #include <KMessageBox>
 
-#include <QApplication>
 #include <QScreen>
 
 #include <QTimer>

src/file-io/collection.h

@@ -8,7 +8,6 @@
 #define PALAPELI_COLLECTION_H
 
 #include <QStandardItemModel>
-#include <QMutex>
 
 class KConfig;
 class KConfigGroup;

src/window/puzzletablewidget.cpp

@@ -13,10 +13,11 @@
 #include "palapeli_debug.h"
 
 #include <QToolBar>
-#include <QGridLayout>
 #include <QProgressBar>
 #include <QStackedWidget>
 #include <KLocalizedString>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
 
 //BEGIN Palapeli::TextProgressBar