changes to CircleOfFifths

split notes into 2 Arrays, sharps and flats, and add them to 3rd array
(maybe theres a better way?)

have all 15 keys of the circle of fifths

CircleOfFifths.getNotes() returns all 21 notes

all notes should exist only once

//TODO
//make CircleOfFifths singleton scope
//check for errors
//try to make more robust