Add function and command to toggle mappings

* Create `auditory#ToggleMappings()` that turns sounds on if they're off
  and off if they're on
* Create an `:AuditoryToggle` command that runs the toggle function in a
  more user-friendly callable way

With a toggle command, turning Auditory on or off can be as simple as
hitting 1 custom mapping. With our previous `AuditoryOn` and
`AuditoryOff`, you would have to use 2 mappings: 1 for on and another
for off.

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