Rebalance plumbing

[elvanaud]

There are multiple problems currently with the 2.0 fluid system:
-Valves(one way) behave somewhat like pumps: they can extend pipeline length and pump to speeds up to 4x that of regular pumps thus neglecting the need for our regular pumps.
Plus this monstrosity allows this:

We should probably solve this by introducing valve tiers and nerfing their flow rate.
Additionally, fluid boxes allow a "max_pipeline_extent" parameter which could be used to reintroduce pipe tiers as well as limit the use of valves to extend the pipeline. Tanks may also be subject to reduced pipeline extents to force the use of pumps.

saironiq (on discord) proposed an alternative idea for rebalancing: remove the one way valves and use auxillary valves instead

[TheZouave007]

I haven't looked at the factorio code, but if the code that determines if a pipeline is valid or not only runs when a pipeline is extended, then it should be possible to make that operation more expensive without tanking UPS. This means that while pipeline parts might have separate fill levels, we could look through several pipeline parts to determine the size of the total pipeline. This would also allow us to reintroduce the pressure mechanic by having tanks be a separate pipeline part from pipes, along with valves.

The old nullius on factorio 1.0 has auxiliary valves as a poor mans relief/top-up valve for tier 1 pipes. If we are going to tier the valves, we should get rid of the auxiliary valve and just have relief/top-up valves that correspond to pipe tiers. I think the one-way valve might still be useful in niche applications, like a poor mans high water mark gauge or for putting multiple fluids through a single pipeline part,

A bunch of different ideas for reworking plumbing:

• valves reduce pressure by say 10% whenever a pipeline goes through them
• Higher tier pumps can sense the fill level 'behind' and 'in front of' them, and can use that information to turn on or off (maybe this would fit better with circuit logic?)
• an alternative to valve tiers is to have an upgraded relief/top-up valve where the fill level to trigger is variable, and if combined with dropping pressure across the valves, could have a 5% drop instead of 10%.