This commit changes Configurator's methods to be SetterMethods instead
of IOMethods, as Configurator is specifically made for frontend-managed
settings just for the backend, so no storing/loading is needed on the
backend's side.
This commit also changes SetterMethod to allow methods done to the
backend to error out, in case the setting value is invalid somehow.
Setter methods that are called by the backend (as opposed to the
frontend) must never error.
diamondburned
4e11444f6c