usermanager: Remove concept of global authz provider Rationale: - Removes a bunch of code! - We don't have many cases where an actor is not bound to one of our hosts - A notable exception is the admin shell, but if we ever attempt to lock those sessions down, there is a load of other work that also has to be done. And it's not clear if we would need a global authz provider for that anyway. - Removes an extra edge case from the necessary mental model for operators - Sessions that aren't bound to a host generally are anonymous or have an alternative auth model (such as by IP addres). - With the encapsulation now provided by util.roles, ad-hoc "detached roles" can still be created anyway by code that needs them.

local record lib
	record queue<T>
		size : integer
		count : function (queue<T>) : integer
		enum push_errors
			"queue full"
		end

		push : function (queue<T>, T) : boolean, push_errors
		pop : function (queue<T>) : T
		peek : function (queue<T>) : T
		replace : function (queue<T>, T) : boolean, push_errors
		type iterator = function (T, integer) : integer, T
		items : function (queue<T>) : iterator, T, integer
		type consume_iter = function (queue<T>) : T
		consume : function (queue<T>) : consume_iter
	end

	new : function<T> (size:integer, allow_wrapping:boolean) : queue<T>
end
return lib;