Add bank mode to BB and make the font bigger


the LED screen is a bit too small. Maybe it should have two modes like eventide pitchfactor, which has play mode and bank mode.

For BB, in play mode, just like what we have now all the details, In BANK MODE, we only need the song names and the part of the song-- intro, verse, chorus, outtro and transition fills. then we have more space to make the font size bigger. we can easily see it when we do gigs.