added findModelByChannel method
implemented findModelByChannel method, replaced identical code w/ call to method
cleanup commented code from prev. commit
more cleanup:
process itemChanged events
added parseValueChanged method, TODOs for missing code in event handlers
fixed list header width to remove runtime errors
cleanup debug lines
whitespace cleanup
styling on progress bar
progress bar styling; hide time if == 0:00
cleanup output
instead of checking all channels, check if model is null inside event handling methods