Moderation commands

[matthias-luger]

• Add a command to add the "warned" role to a user.
  • I should be able to add a reason as a optional parameter
  • I should be able to add the time until the "warned"-role gets automatically removed (default: 2 weeks)
• Add a command to ban a user for a certain time. I should also be able to add a reason.
• Add a command to get information about the rep. This should display a history of past punishments and punishments that are finished (e.g. the warning was automatically removed, or the ban time is over)
• The commands are always used as an answer to a message. The author of the message is the targeted user.

[Flou21]

mostly implemented in the other discord bot banning can be done with yagpdb