Fix #1438

Conflicts:
	src/guiengine/widgets/ribbon_widget.cpp
Display wrong way message after a delay.

Conflicts:
	src/karts/kart.hpp
Reset counter when game is restarted
Avoid to update ribbon widget too many times.

It fixes displaying screenshots in GP editor after switching between category tabs.

Conflicts:
	src/guiengine/widgets/dynamic_ribbon_widget.cpp
Fixed warning in cmake 3.0 and above