Server-side voice chat join sounds

Hello Mr John Discord, long time fan. 

So after chatting with some friends, we figured that being able to select a notification jingle for when you enter voice chat would be a neat idea. Not user uploaded, but from a pre-designated pool so as not to take up server space with endless .wavs from users. Perhaps Nitro could have that feature, but I digress.

The ability to control the privilege to set your custom voice chat notification being tied to roles would be good too, or even for certain role groups like moderators to have a jingle set by the server admin.