implement M109 and M190 in the host to avoid the arduino locking up until temperatures reached
introduce callbacks for preheating start and preheating done
move status code calculation to dedicated method
add action to newly added preheating callbacks
more work on new M109/M190 preheating implementation
use new status method from RepRapHost object
use new RepRapHost.emergencystop method and callback
implement new temperature-status footer that is always visible
remove now obsolete temperature refresh timers from within touchapp