Target stripes follow chord progression.
- Distance from target pitch controls speed.
- Hardcode volume thresholds.
- Unique players.
- Draw player texture on target stripe.
- Seek to pitch octave closest to current pitch.
Merge branch 'master' of https://github.com/mrasmus/Barbershop

Conflicts:
	barbershop/glwrap.cpp
	barbershop/main.cpp