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Allows admins to define a set of "roles" for easier player privilege
management.
The role command (re)defines a role as a set of privs:
/role <role> priv,priv,priv
Each priv can be a primitive priv or a role name. Role names
will be expanded at the time they're applied, so redefining a role
that other roles depend on may affect all dependant roles.
There are a few special built-in roles:
all - all privileges
default - the set of privileges assigned to new players
The built-in roles cannot be redefined.
/grant and /grantme can be used to grant roles the same as privs.
First, all roles are expanded into their privs.
Revoking a role effectively revokes all privs it grants.
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