Antispam exceptions

[danirod]

Add a system to godfather trusted accounts (based on tags or roles). Let the bot look away when inspecting a message if the poster is a trusted account.

Example use case: someone who has been in the server for a month and that is very active may post a link to a Facebook page organically rather than for purposes of doing spam. In such case, having a way to tag (either manually or as part of the karma system) a user as a trusted one so that the message can be posted anyway would be good.