TyrantCard: Strip leading spaces in !h and !unhash
TyrantCard: Use Enumerable#all? to check hash
TyrantCard: Use regexen to accept \s+
Auth: Remove explicit known_ids

Instead, dynamically create as needed.
Removing this makes manual management of the YAML file easier and less
error-prone, as deleting a user had to be done by deleting an entry in
nicks and an entry in known_ids.

We can consider keeping it but having only nicks be saved in YAML. This
saves repeated regeneration if !register is used repeatedly but
maintains the increased maintainability.
TyrantMission: Allow bare card IDs without []