* Layered pipes no longer stick out of their tile, also vents and other
machines will always be in the middle of the tile.
* Layer manifold now looks like an adaptor.
* Some pipe mapping helpers were made into macros so maintianing things is
easier.
* Some unused icons were removed.
* A lot of icons were added, so that pipe layering looks better.
* Layer manifold renamed to layer adaptor and resprited to look more like an
adaptor.
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