[Emacspeak] Speech-Server: Changes

["T.V Raman" <raman@xxxxxxxxxx>]

This is mostly for folks working on the Mac server ie Robert etal.

1. Emacspeak is transitioning to using ogg files for auditory icons and
   audio prompts.
2. MP3 files -- which were present in sounds/prompts have gone away to
   be replaced by ogg files.
3. For now I'll preserve auditory icons as both wav and ogg -- so
   pan-chimes and ogg-chimes for now.
4. The wav files will eventually go away
5. Emacspeak will send the speech server ogg files when
   emacspeak-auditory-icon-function is set to
   emacspeak-serve-auditory-icon, that change is already in Git.
6. See code in servers/tts-lib.tcl for the change.

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