Implement warning and auto-muting users.

[DeveloperTK]

Any violation to the rules that doesn't result in a ban gets the user a warning. If the user collects three warnings, they get assigned a mutedrole.

Also implement a way in that a user can be temporarily muted by moderators. Example:

kit tempmute <@!user> <time>[unit]
kit tempmute @user 2h