Add the Concept of a Song

[gbroques]

As a user, I want the concept of a song, to be able to play a lot of different songs with Cozmo.

A song is a series of notes.

Each specific song could be a class, that inherits from a abstract base Song class.

Our init_game_loop(Song song) function could take in a song as an argument.

Here's what it might look like in Python code:

class MaryHadALittleLamb(Song):
    notes = [E, D, C, D, E, E, E, D, D, D, E, E, E, ..., E, D, C]

init_game_loop(MaryHadALittleLamb());

[gbroques]

Closed by 5190ce0