Added Zwerkules Rural override tileset

Added Zwerkules Rural override tileset.

_content/biorural/ttr01_s13_01.wok

@@ -0,0 +1,81 @@
+# Rewritten by CleanModels 3 Version 3.5.1 Mon Jul 01 17:08:57 2019
+#MAXWALKMESH  ASCII
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+  specular 0 0 0
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+  shadow 0
+  transparencyhint 0
+  bitmap NULL
+  orientation 0 0 0 0
+  position 0 0 0
+  render 0
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+endnode
+endwalkmeshgeom ttr01_s13_01