Add clearSysexEvents
Add clearSysexEvents

I discovered that if there are Sysex events added to a track via `addSysex`, then `clear()` won't work properly. The track length remains the same and `MusicTrackClear` prints an error similar to "Invalid beat range or source track is empty".
The solution, for now, is to offer a way to conveniently remove those Sysex events. We already have an API to add those events so it makes sense to offer the reverse right?
eljeff/AudioKit,adamnemecek/AudioKit,audiokit/AudioKit,adamnemecek/AudioKit,audiokit/AudioKit,audiokit/AudioKit,eljeff/AudioKit,eljeff/AudioKit,audiokit/AudioKit,eljeff/AudioKit,adamnemecek/AudioKit,adamnemecek/AudioKit