Replace macros by delegating ctors #5278
Description
Use delegating constructors instead of macros. For beginners, but requires C++11 knowledge.
Start your PR by branching from stable-1.2. Fix the following comments:
src/gui/widgets/LedCheckbox.cpp://! @todo: in C++11, we can use delegating ctors
src/gui/widgets/Knob.cpp://! @todo: in C++11, we can use delegating ctors
src/gui/widgets/LcdWidget.cpp://! @todo: in C++11, we can use delegating ctors