Prevent original names being taken by other players
If an active player is renamed (whether by soulbind or Chaos Lord) then can request that their original name be restored.
We can ensure this is possible by preventing creating characters with another character's original name.
It also looks like you can soulbind rename a character to the name of an existing character.. that's probably in error.
(Restrictions will not apply to Chaos Lord changes - the aim here is to prevent confusion over player names in the main round, e.g. due to impersonation, not to prevent Chaos shenanigans).