Add flow_scaling to ValvePrototype as well

[petrathekat]

Hello, (especially Boskid),

flow_scaling is really handy on PumpPrototype, but I'm having a situation where I'd like it to exist on ValvePrototype as well. (For a mod I am working on, I would like it if a given container filled up quickly to some threshold determined by a valve_threshold_override; right now it asymptotically creeps up on the max.)

Thank you!

[Stringweasel]

Have you tried ValvePrototype::flow_rate?

Edit: scratch that, that's something else

[petrathekat]

Yes, unfortunately even if I set it to some obscenely high value, the actual flow rate still slows to a crawl as it reaches the threshold.