MusicReader: object-oriented approach to reading music and separating notes

This code integrates destroyBars, cursory_search, and get_lines into
an object-oriented music reader.  Right now it can split into lines and
split into notes.  Needs note identification and packaging it all in a
way for the Arduino to read.
Works best with ode_to_joy.  There are a few issues atm, I'll talk them
over with Lindsey, but it gets it very much mostly correct