LoggerStream logs Date, Duration; error counting

close #15, close #18
first take on StatusBar, #25
resurce images tidied
GUI refresh and further work on StatusBar #25, closes #20
Merge branch 'logger' into wielotorowość

Conflicts:
	QTrainSim/mainwindow.cpp
	QTrainSim/mainwindow.h
	QTrainSim/qtrain.cpp
	core/Train.cpp