New Persian wall, wall tower, and gate placeholder

This was SVN commit r10676.

binaries/data/mods/public/art/actors/props/structures/persians/wall_tower.xml

@@ -3,7 +3,7 @@
 
   <group>
     <variant frequency="1">
-      <mesh>props/pers_wall_tower.dae</mesh>
+      <mesh>props/pers_wall_tower_prop.dae</mesh>
       <texture>structural/pers_struct.dds</texture>
     </variant>
   </group>

binaries/data/mods/public/simulation/templates/structures/pers_wall.xml

@@ -1,10 +1,26 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_structure_defense_wall">
+  <Cost>
+    <BuildTime>40</BuildTime>
+    <Resources>
+      <stone>100</stone>
+    </Resources>
+  </Cost>
+  <Footprint>
+    <Square width="24.0" depth="8.0"/>
+    <Height>9.0</Height>
+  </Footprint>
+  <Health>
+    <Max>6000</Max>
+  </Health>
   <Identity>
     <Civ>pers</Civ>
     <SpecificName>Dida</SpecificName>
     <History>These were the massive walls that Nebuchadnezzar built to protect the city. It is said that two four-horse chariots could easily pass by each other. Babylon, although not an official royal residence (there were 4 of them all together), was a preferred place for holidays.</History>
   </Identity>
+  <Obstruction>
+    <Static width="22.0" depth="7.0"/>
+  </Obstruction>
   <VisualActor>
     <Actor>structures/persians/wall.xml</Actor>
   </VisualActor>

binaries/data/mods/public/simulation/templates/structures/pers_wall_gate.xml

@@ -1,16 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_structure_defense_wall_gate">
+  <Cost>
+    <BuildTime>40</BuildTime>
+    <Resources>
+      <stone>100</stone>
+    </Resources>
+  </Cost>
   <Footprint>
-    <Square width="25.0" depth="8.5"/>
-    <Height>8.0</Height>
+    <Square width="24.0" depth="8.0"/>
+    <Height>9.0</Height>
   </Footprint>
+  <Health>
+    <Max>6000</Max>
+  </Health>
   <Identity>
     <Civ>pers</Civ>
     <SpecificName>Duvitaparnam</SpecificName>
     <History>The several ceremonial entrances to the great city of Babylon were furnished with magnificent gates, the gate of Ishtar being the most splendid of all.</History>
   </Identity>
   <Obstruction>
-    <Static width="25.0" depth="8.5"/>
+    <Static width="22.0" depth="7.0"/>
   </Obstruction>
   <VisualActor>
     <Actor>structures/persians/wall_gate.xml</Actor>

binaries/data/mods/public/simulation/templates/structures/pers_wall_tower.xml

@@ -1,16 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_structure_defense_wall_tower">
+  <Cost>
+    <BuildTime>40</BuildTime>
+    <Resources>
+      <stone>250</stone>
+    </Resources>
+  </Cost>
   <Footprint>
-    <Square width="8.0" depth="8.0"/>
+    <Square width="9.5" depth="9.5"/>
     <Height>18.0</Height>
   </Footprint>
+  <Health>
+    <Max>7500</Max>
+  </Health>
   <Identity>
     <Civ>pers</Civ>
     <SpecificName>Dezhak</SpecificName>
     <History>When Cyrus the Great campaigned in the north and chose to establish the river Jaxartes as a boundary, he constructed a mighty fortress to protect his territories from Scythian raids. It was called Cyropolis and was situated close to the place where Alexander the Great later built his Alexandria Eschatae.</History>
   </Identity>
   <Obstruction>
-    <Static width="8.0" depth="8.0"/>
+    <Static width="8.5" depth="8.5"/>
   </Obstruction>
   <VisualActor>
     <Actor>structures/persians/wall_tower.xml</Actor>