Adds support for events. You can now write callbacks for events by using the new decorators or the `subscribe_event` function:
player = MPyg123Player()
player.on(MPyg321Events.ANY_STOP)
def callback(context):
print("Any stop event occured")
or
def my_func(context):
print("Other event subscribed")
player.subscribe_event(MPyg321Events.ANY_STOP, my_func)