Timeout bot

[swapdub]

Currently, there is no Timeout check/function. This leads to many issues when users are done with the bot. The goal is to Timeout when all users have left the voice channel
I guess the steps would be:

• Check how many users are in Voice Channel in some non-blocking (async) way
  OR
• Check once all songs have finished playing

then

• Execute the disconnect command

Personally, I would want help implementing the async way. So any suggestions/input are welcome with regards to that 👍.