Redrew all of the not-low-poly pipe-related models

to higher quality.  Way more polys than before, but
without a measurable drop in FPS.

Also tweaked the textures for the pump and flow
sensor, and tweaked the low-poly models for them,
so that low-poly models use a different part of
the texture for the "light" on the side (allows
the higher-poly models to just put a glow there
and use a raised dome for the actual light).

Also fixed a Z-fighting issue with the grating on
the bottom of the pump (both versions)

models/pipeworks_flow_sensor_lowpoly.obj

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 vt 0.2451 0.7549
 vt 0.2451 0.9902
 vt 0.0098 0.9902

models/pipeworks_pump_lowpoly.mtl

@@ -1,13 +0,0 @@
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-# Material Count: 1
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-illum 2
-map_Kd /home/vanessa/Minetest-related/mods/my_mods/pipeworks/textures/pipeworks_pump_on.png

models/pipeworks_pump_lowpoly.obj

@@ -1,55 +1,70 @@
-# Blender v2.78 (sub 0) OBJ File: 'pipe-master-lowpoly.blend'
+# Blender v2.78 (sub 0) OBJ File: 'pipe-pump-lowpoly.blend'
 # www.blender.org
-mtllib pipeworks_pump_lowpoly.mtl
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