Add a filter bar

[janosgyerik]

This is a typical input data from one of my bluetooth sensors:

#210914:210452:668$GPRMC,194125.918,V,4851.5581,N,00220.2004,E,0.00,0.00,210914,,,N*74
#210914:210453:661$GPRMC,194126.918,V,4851.5581,N,00220.2004,E,0.00,0.00,210914,,,N*77
#210914:210453:763$PSEN,CO2,ppm, 0915
#210914:210454:661$GPRMC,194127.918,V,4851.5581,N,00220.2004,E,0.00,0.00,210914,,,N*76
#200914:160256:674$GPRMC,143935.410,V,4851.5581,N,00220.2004,E,0.00,0.00,200914,,,N*73
#200914:160257:651$PSEN,CO2,ppm, 1357
#200914:160257:674$GPRMC,143936.410,V,4851.5581,N,00220.2004,E,0.00,0.00,200914,,,N*70
#200914:160258:673$GPRMC,143937.410,V,4851.5581,N,00220.2004,E,0.00,0.00,200914,,,N*71
#200914:160259:604$PSEN,CO2,ppm, 1311
#200914:160259:676$GPRMC,143938.410,V,4851.5581,N,00220.2004,E,0.00,0.00,200914,,,N*7E

In this sample, the most interesting lines are the ones with $PSEN, the $GPRMC are garbage for my intents and purposes. It will be great to have some kind of filter bar:

• If I enter the text PSEN, dynamically as I type, it should apply to the view as a filter and hide all other lines
• It would be great to have the inverse option too: if I enter GPRMC, hide all GPRMC lines
• The view filtering should affect the data recording: all data should still be recorded
• To keep the user interface simple, it might be nice to hide the filter toolbar by default, and let users toggle it in settings (or some other way)