ircd:Ⓜ️:user: Simplify user::room_account_data impl w/ modern linkage. ircd:Ⓜ️:user: Modernize user::profile impl linkage. ircd:Ⓜ️:user: Modernize user::account_data impl linkage. ircd:Ⓜ️:user: Simplify user::ignores impl w/ modern linkage.