added the concept of a mod mail role, these are roles being pinged when a thread is opened, and they also are able to execute mod mail related commands
fixed past thread count in mod mail header
added convenience method to allow a role to execute a whole feature
added optional note parameter for close
fixed state not being saved in database for mod mail thread
changed logging of mod mail to be templated, instead of replaying the messages
added reaction to indicate the user, that the message was processes by modmail
fixed future handling for user message replies (we blocked)
added header for initial information about the user when he opens a thread
fixed duration formater resulting in new lines
