autoload/auditory.vim: Make dictionary of mappings

Create a dictionary with all our mappings. We'll use this to activate
them programmatically. I think it might also be interesting to provide
this as a configurable variable within the plugin so that users can
change the built-in mappings if they so choose.

Note that this doesn't currently work because you can't have comments in
dictionary literals in Vimscript. Thanks to Raimondi on #vim for
confirming that for me after I played around with this.

Also thanks to bairui/dahu for his suggestion for emulating comments in
dict literals: https://gist.github.com/dahu/18b48c70444d8078f7d7

    " Barry Arthur, July 2015
    " Kludge emulating comments in dict literals
    " :-0 surprised?!

    function! StripComments(comment_leader, dict)
      return filter(a:dict, 'v:key !~ "^" . escape(a:comment_leader, "\"")')
    endfunction

    let x = StripComments('REM', {
          \  'a'  : 1
          \, 'REM This is a nasty workaround mimicking comments in dict literals'                                :-0
          \, 'b'  : 2
          \, 'REM Duplicate keys are not tolerated within dict literals, hence the numbered comment keys'        :-0
          \, 'c'  : 3
          \, 'REM For the younger audience members, REM stands for "remark" and was the comment leader in BASIC' :-0
          \, 'd'  : 4
          \})

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