Fix pipe renderer using wrong texture for center
Add Flood Gate Texture

Provided by laz2727, many thanks!
Clean up and consolidate Pipe API interfaces

Note: injectItem() takes the opposite side that entityEntering() used
to.
Internalized IPipedItem

May delete eventually depending on feedback.
Added Daizuli Pipe

The Daizuli Pipe is similar to a Iron Pipe, except it only routes
matching colored itemstacks that have been painted by a Lapis Pipe.

The color can be set via Gate Action or via shift-click with a Wrench.