Trinary atmospheric device variants

- Mirror filter - standard filter with the output mirrored to the opposite side
- T-Mixer - takes left and right inputs then outputs the mix perpendicular to the inputs
- Mirror mixer - standard filter with the output mirrored to the opposite side
- Added all three to pipe dispenser and construction code so they can be built in-game
Merge pull request #4892 from Loganbacca/trinary

Gas mixer and filter variants