Applying stwf's sound attribute to ballista + pers fortress decals added

This was SVN commit r13560.

binaries/data/mods/public/art/actors/structures/persians/fortress.xml

@@ -8,6 +8,7 @@
         <prop actor="props/structures/persians/fortress.xml" attachpoint="root"/>
         <prop actor="props/units/weapons/arrow_front.xml" attachpoint="loaded-projectile"/>
         <prop actor="props/units/weapons/arrow_front.xml" attachpoint="projectile"/>
+        <prop actor="props/structures/decals/dirt_5x5.xml" attachpoint="root"/>
       </props>
     </variant>
     <variant frequency="1" name="Persian_Fortress_B">
@@ -16,6 +17,7 @@
         <prop actor="props/structures/persians/fortress_b.xml" attachpoint="root"/>
         <prop actor="props/units/weapons/arrow_front.xml" attachpoint="loaded-projectile"/>
         <prop actor="props/units/weapons/arrow_front.xml" attachpoint="projectile"/>
+        <prop actor="props/structures/decals/dirt_5x5.xml" attachpoint="root"/>
       </props>
     </variant>
   </group>

binaries/data/mods/public/art/actors/units/romans/siege_rock.xml

@@ -5,7 +5,7 @@
     <variant frequency="100" name="rome ballista">
       <animations> 
         <animation file="mechanical/rome_ballista_idle.dae" name="Idle" speed="100"/>
-        <animation event="0.75" load="0.7" file="mechanical/rome_ballista_atttack.dae" name="attack_ranged" speed="150"/>
+        <animation event="0.75" load="0.7" file="mechanical/rome_ballista_atttack.dae" name="attack_ranged" sound="0" speed="150"/>
       </animations> 
       <mesh>structural/rome_ballista.dae</mesh>
       <textures><texture file="structural/rome_ballista.png" name="baseTex"/></textures>

binaries/data/mods/public/audio/attack/siege/ballist_rome_attack.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8" standalone="no" ?>
+<SoundGroup>
+	<Gain>1</Gain>
+	<Pitch>1</Pitch>
+	<Priority>100</Priority>
+	<ConeGain>1</ConeGain>
+	<ConeInner>360</ConeInner>
+	<ConeOuter>360</ConeOuter>
+	<Looping>0</Looping>
+	<RandOrder>1</RandOrder>
+	<RandGain>1</RandGain>
+	<GainUpper>0.7</GainUpper>
+	<GainLower>0.4</GainLower>
+	<RandPitch>1</RandPitch>
+	<PitchUpper>1.1</PitchUpper>
+	<PitchLower>0.9</PitchLower>
+	<Threshold>1</Threshold>
+	<Decay>3</Decay>
+	<Replacement>ballist_rome_attack_01.ogg</Replacement>
+	<Path>audio/attack/siege</Path>
+	<Sound>ballist_rome_attack_01.ogg</Sound>
+</SoundGroup>

binaries/data/mods/public/simulation/templates/units/rome_mechanical_siege_ballista_unpacked.xml

@@ -8,6 +8,11 @@
     <Time>10000</Time>
     <State>unpacked</State>
   </Pack>
+  <Sound>
+    <SoundGroups>
+      <attack>attack/siege/ballist_rome_attack.xml</attack>
+    </SoundGroups>
+  </Sound>
   <UnitMotion>
     <WalkSpeed>0.001</WalkSpeed>
     <Run>