TODO: Mute system

[mikeshardmind]

• Mutes should be handled by role modifications
• Mute should not be dodgeable
• Mutescan be either timed or not.

[mikeshardmind]

I'm going to take the remaining work on this after discussion.

This entails:

• timed mutes
• (maybe) a setting to ban a user who is caught mute dodging too many times.