Added Quartz Fluid Pipe

Added Quartz Fluid Pipe, functionally equivalent to the cobble and stone
varieties, and won't connect to either.
Quartz Fluid Pipe Texture Change

Changing the texture back to how it should be on the quartz fluid pipe,
now that the iron fluid pipe texture is also corrected.
Iron Fluid Pipe Texture Update

Darkened the iron fluid pipe's coloring to match the iron item pipe's.