AppManager: format
GuiMacros: add modifiers and buttons checking macros (for readability!)

- note that for modifiers we test for *equality*, not bit-per-bit.
Engine: readability
AnimatedCheckBox: use GuiMacros.h
AnimationButton: use GuiMacros.h
ClickableLabel: format
ComboBox: use GuiMacros.h
CurveWidget: use GuiMacros.h
FromQtEnums: format
GroupBoxLabel: format
Gui: format
GuiApplicationManager: format
Histogram: use GuiMacros.h
KnobGuiTypes: format
LineEdit: format
MenuWithToolTips: format
NodeCreationDialog: format
NodeGraph: use GuiMacros.h
RotoGui: use GuiMacros.h
RotoPanel: use GuiMacros.h