Formatted Qt/ according to the styleguide.

Base/CheckboxDelegate.cpp

Base/CheckboxDelegate.h

Base/ColorPickerPushButton.cpp

Base/ColorPickerPushButton.h

Base/OGSError.h

Base/QNonScalableGraphicsTextItem.cpp

Base/QNonScalableGraphicsTextItem.h

Base/QValueTooltipSlider.cpp

Base/QValueTooltipSlider.h

Base/RecentFiles.cpp

Base/RecentFiles.h

Base/StrictDoubleValidator.h

Base/StrictIntValidator.h

Base/TreeItem.cpp

Base/TreeItem.h

Base/TreeModel.cpp

Base/TreeModel.h

Base/TreeModelIterator.cpp

Base/TreeModelIterator.h

Base/modeltest.cpp