Started to port to qt5 [WORK-IN-PROGRESS]

[LinuxDonald]

Started to port to qt5. Not done. @jakoch this is the last errors:

[linuxdonald@linuxdonald-pc src]$ make 
g++ -c -pipe -O2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -Wall -W -D_REENTRANT -fPIC -DNOMINMAX -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. -Ifreeglut/include -isystem /usr/include/qt -isystem /usr/include/qt/QtOpenGL -isystem /usr/include/qt/QtWidgets -isystem /usr/include/qt/QtGui -isystem /usr/include/qt/QtCore -I. -I. -I/usr/lib/qt/mkspecs/linux-g++ -o mainwindow.o mainwindow.cpp
mainwindow.cpp: In Elementfunktion »void MainWindow::textureSelectionChanged()«:
mainwindow.cpp:252:23: Fehler: »class QOpenGLWidget« has no member named »highlightedChanged«; did you mean »windowTitleChanged«?
    ui->previewWidget->highlightedChanged(indices);
                       ^~~~~~~~~~~~~~~~~~
mainwindow.cpp:274:21: Fehler: »class QOpenGLWidget« has no member named »highlightedChanged«; did you mean »windowTitleChanged«?
  ui->previewWidget->highlightedChanged(indices);
                     ^~~~~~~~~~~~~~~~~~
mainwindow.cpp: In Elementfunktion »void MainWindow::refreshPressed()«:
mainwindow.cpp:404:21: Fehler: »class QOpenGLWidget« has no member named »refreshed«; did you mean »redirected«?
  ui->previewWidget->refreshed(imgAtlas);
                     ^~~~~~~~~
mainwindow.cpp:405:21: Fehler: »class QOpenGLWidget« has no member named »updateOccupation«; did you mean »updateBehavior«?
  ui->previewWidget->updateOccupation(regions);
                     ^~~~~~~~~~~~~~~~
make: *** [Makefile:978: mainwindow.o] Fehler 1