Although the naming is still a bit off, it's much cleaner to use signals instead of functions. It's
also more in line with how default QML components handle these kind of situations
CURA-6006
Toolbox crashes on Mac OS X due to reaching the max limit of file
handlers. This seems to be caused by the loading the "loading.gif"
animation image. Probably because many widgets are created and each of
them has an animation image, and Qt (5.8?) seems to load everything at
the same time.
