Filter & subtotals of statistics by instrument

When I check statistics it will be useful to filter by instrument so I can have the total time for each instrument I play.

Hey, we just launched this on iOS. You can go Settings -> Instruments and it will show it. Actually this update releases later this week so hang in... we'll bring that to Android eventually as well. There's also a chart that shows practice time by instrument.

Changed the status to "Completed"