Added valve rendering, removed unused connection directions of valves.
Steve's blood is red, not purple. (It's now purple when properly hydrated, compared to blue before)
Un-reduced the flowing range of blockF_u. Now you have a very good reason to put it in an enclosed space.
Render reagents before tiles - allows correct rendering of PipeObstacleTiles and KidneyTiles.
To enable experimentation, let's give Steve 4 kidneys, of which only 2 are initially connected.
Move mouth tile to a more logical position on texture sheet.
MouthTile too.
Added mode switcher, instead of using different mouse buttons.