[WIP] Rework voice & music module

[lightdiscord]

Trying to rework the voice and music module.

What to do?

• Better queue system (Maybe a common one for both modules)
• Better TTS system.
• Stream interface

Optional

• Pre-load next item in queue.
• Let the client choose between every TTS engines.

Before merging

• Code review
• Uncomment modules

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Unresolved questions

• How to add a radio in the queue ? Should we put it at the end while there are music to play or should we next it to play other music ?

[DeltaEvo]

TTS should not enter the queue, but instead stop music, play tts and continue music

[DeltaEvo]

We can get the current stream with https://discord.js.org/#/docs/main/stable/class/StreamDispatcher?scrollTo=stream
save it, play a new and after the end replay the old stream
But we need to delay the handling of the events https://github.com/Popcorn-moe/Discord/blob/master/src/modules/Music/index.js#L185 to the next stream