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mod_external_services: Also validate services added by other modules This ensures that problems with entries added other modules, e.g. mod_turn_external, are reported on startup. However, this depends on load order and whether a `module:depends()` call comes before the `module:add_item()` call. A followup commit will do something about that.

local record lib
	short : function () : string
	medium : function () : string
	long : function () : string
	custom : function (integer) : function () : string

end
return lib