Fencegate: prevent y-fighting at top.

We raise the height of the fencegate node by 0.0001 to make the
fencegate post stop fighting with node blocks. This makes the
gate pole appear to be cut through the node, and doesn't leave
a gap when stacking fencegates, which would look odd.

mods/doors/models/doors_fencegate_closed.obj

@@ -3,21 +3,21 @@
 mtllib gate_closed.mtl
 o Cube_Cube.001
 v -0.625000 -0.500000 0.125000
-v -0.625000 0.500000 0.125000
+v -0.625000 0.500100 0.125000
 v -0.625000 -0.500000 -0.125000
-v -0.625000 0.500000 -0.125000
+v -0.625000 0.500100 -0.125000
 v -0.375000 -0.500000 0.125000
-v -0.375000 0.500000 0.125000
+v -0.375000 0.500100 0.125000
 v -0.375000 -0.500000 -0.125000
-v -0.375000 0.500000 -0.125000
+v -0.375000 0.500100 -0.125000
 v 0.375000 -0.500000 0.125000
-v 0.375000 0.500000 0.125000
+v 0.375000 0.500100 0.125000
 v 0.375000 -0.500000 -0.125000
-v 0.375000 0.500000 -0.125000
+v 0.375000 0.500100 -0.125000
 v 0.625000 -0.500000 0.125000
-v 0.625000 0.500000 0.125000
+v 0.625000 0.500100 0.125000
 v 0.625000 -0.500000 -0.125000
-v 0.625000 0.500000 -0.125000
+v 0.625000 0.500100 -0.125000
 v -0.375000 0.187500 0.062500
 v -0.375000 0.312500 0.062500
 v -0.375000 0.187500 -0.062500

mods/doors/models/doors_fencegate_open.obj

@@ -3,21 +3,21 @@
 mtllib gate_open.mtl
 o Cube_Cube.001
 v -0.625000 -0.500000 0.125000
-v -0.625000 0.500000 0.125000
+v -0.625000 0.500100 0.125000
 v -0.625000 -0.500000 -0.125000
-v -0.625000 0.500000 -0.125000
+v -0.625000 0.500100 -0.125000
 v -0.375000 -0.500000 0.125000
-v -0.375000 0.500000 0.125000
+v -0.375000 0.500100 0.125000
 v -0.375000 -0.500000 -0.125000
-v -0.375000 0.500000 -0.125000
+v -0.375000 0.500100 -0.125000
 v 0.375000 -0.500000 0.125000
-v 0.375000 0.500000 0.125000
+v 0.375000 0.500100 0.125000
 v 0.375000 -0.500000 -0.125000
-v 0.375000 0.500000 -0.125000
+v 0.375000 0.500100 -0.125000
 v 0.625000 -0.500000 0.125000
-v 0.625000 0.500000 0.125000
+v 0.625000 0.500100 0.125000
 v 0.625000 -0.500000 -0.125000
-v 0.625000 0.500000 -0.125000
+v 0.625000 0.500100 -0.125000
 v 0.434859 0.187500 -0.872359
 v 0.434859 0.312500 -0.872359
 v 0.559859 0.187500 -0.872359