Less Wasteful Desalination

Thermal desalination plant that is able to supply water or brine (or chlorine/salt) in any ratio up to the maximum provided by 8 thermal desalinators, while still shutting down completely when neither water nor brine is in demand.

Water should be taken from one of the two land-side balancers, with the bottom balancer taking precedence over the top balancer. Brine should be taken from one of the two ocean-side balancers, with the same precedence order. For convenience, there's already a pipe hooked up to chlorine and salt production, as well as a pipe to a brine output storage.

The logic is taken from the Less Wasteful Air Separator blueprint by Kayser (https://hub.coigame.com/Blueprint/Detail/538), improved to be able handle higher flow rates.