With the current rework to the air distro and scrubbers system, I completely forgot about gas meters and left a bunch of them around to no longer work. Whoops. This adds two subtypes for gas meters that work on layers 1 and 3. I found and replaced every broken gas meter, as well as moved a couple others. I originally added a subtype to atmos/distro_loop but that just seems unnecessary, so it was removed.
Mappers can now place layer 1/3 gas meters, which will hopefully encourage more use of the layers other than 2.
Helianthus00
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