[Feature Request] Leave VC when sharing the channel with only bots

[MaikKrisanov]

Is your feature request related to a problem? Please describe.

When using two separate instances of the music bots (or other bots) and then leaving the Voice Channel, the bots do not automatically leave the channel.

What is your ideal solution to the problem?

When the bot shares the channel only with other bots, it leaves the channel.

How would this feature be used?

1. Have the bot join a voice channel.
2. Have a different, unrelated bot join the voice channel.
3. Leave the voice channel.
4. MusicBot is now expected to leave the voice channel after a certain amount of time.

Additional Info

No response

Checklist

• [X] I have checked the documentation to make sure this feature doesn't already exist
• [X] I have searched for similar feature requests
• [X] I have confirmed that my requests is not on the list of things that will not be added
• [X] I am running the latest version of the bot:

[jagrosh]

This is already what the alonetimeuntilstop field in the config is for. Bots and users that are deafened do not count as "listening", and therefore don't count against the bot considering itself "alone."

[jagrosh]

https://github.com/jagrosh/MusicBot/blob/master/src/main/java/com/jagrosh/jmusicbot/audio/AloneInVoiceHandler.java#L90-L97