Voice channel leasing

[patrickklaeren]

Allow users (with role permission) to "lease" voice channels.

This would allow users to make voice channels on demand, eliminating the need for voice channels to be created permanently.

• Track who, when and what voice channels were created
• Lease voice channels until the last person leaves
• Allow users to specify a maximum number of people
• Periodically clean up voice channels (if no one is in them) (ensuring voice channels are removed if the bot is offline)

[patrickklaeren]

Worked on by @TrueTheos