Also allow prefixing commands by their role name to remove ambiguity
should a person be multiple roles. For example, "seer see foo" and
"augur see foo" will now work if a person is both seer and augur
(whereas normal see foo would be ambiguous). A player will be directed
to use the unambiguous prefixed version if we detect that a role command
will fire multiple times for them (note: coming soon).
For sanity reasons, these role prefixes are implemented as exclusive
commands, meaning no other commands or command aliases may use the same
name. Clone needs to be special-cased in this regard, as clone is both a
role name and a command name.
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