CInfoViewer: rework init and paint of clock

This removes some dimension assignments in start() because of
already existant and usable dimension values that comes directly
from clock object.
Merge remote-tracking branch 'cool-cst-next/cst-next'
Merge branch 'master' of https://github.com/MaxWiesel/neutrino-mp-cst-next

Conflicts:
	src/gui/infoviewer.cpp