Add support to p5.sound

[berinhard]

Pyp5js doesn't support p5.sound. The ideal world would be to have the same API from Javascript "mirrored" to Python. So, for example, the following Javascript code:

function preload() {
  soundFormats('mp3', 'ogg');
  mySound = loadSound('assets/beatbox.mp3');
}

function setup() {
  mySound.play();
}

could be written with Python as:

from pyp5js import *

mySound = None

def preload():
    global mySound
    soundFormats('mp3', 'ogg')
    mySound = loadSound('assets/beatbox.mp3')

def setup():
  mySound.play();

There's an older PR that added support to p5.dom. It can works as a possible guide on how to implement this.

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