Some future visualization features

Some of the visualization features that can be added to the repository:
Using Pycall:
https://github.com/dmpayton/python-fretboard
https://github.com/DCMLab/pitchplots
https://github.com/ravila4/MusicPlots

Using MATLAB.jl:
https://github.com/JuliaMusic/1.1

Using Cxxwrap:
https://github.com/projectM-visualizer/projectm
