add prefabs

tbh at this point it looks like i'm just copying UE. However, UE is
formatted nice and i want people to be able to navigate my system just
as easy.
Deprecating unkown liquid type

This was a cool idea to prevent NPE errors in the api however its
leading to other issues. This could be with how i was using it but it
just needs too go.
Cleanup + prefab changes

Cleaned up and changed a few classes after i added the prefabs. The tank
and sink now use the FluidStorage prefab to make them easier to read.
Sink basicly went down to packet code. Tank will do the same later after
i add in Code to turn it into a fluid network of its own. Also toyed
with release valve but nothing major changed