The pulse method is the default of cava. Now that it is avalable and
works fairly well, I think we can enable it in cava. This way it can
also be used with cmus and other pulseaudio players.
The old method of fifo input (ncmpcpp visualizer output) can still be
enabled by adding the following to the config file
(`~/.config/cava/config`):
```
[input]
method = fifo
```
Cava is an Audio Visualizer that can work together with MPD. It works
out of the Box if you enable "visulizer output" in MPD by either running
`mpc enable 3` or by enabling it in [7] in ncmpcpp.
