Remove a not validating unused sound marker template. While at it remove another unused template in the same folder. Patch by Stan.

Differential Revision: https://code.wildfiregames.com/D412
This was SVN commit r19521.

binaries/data/mods/public/art/actors/props/special/common/marker_object_sound.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<actor version="1">
-  <castshadow/>
-  <float/>
-  <group>
-    <variant frequency="100">
-      <mesh>props/special/marker_object_sound.dae</mesh>
-    </variant>
-  </group>
-  <group>
-    <variant name="base">
-      <textures>
-        <texture file="props/marker_object.png" name="baseTex"/>
-      </textures>
-    </variant>
-  </group>
-  <material>player_trans.xml</material>
-</actor>

binaries/data/mods/public/simulation/templates/special/dummy.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Entity>
-  <Position>
-    <Altitude>0</Altitude>
-    <Anchor>upright</Anchor>
-    <Floating>false</Floating>
-    <TurnRate>6.0</TurnRate>
-  </Position>
-</Entity>

binaries/data/mods/public/simulation/templates/special/marker_object_sound.xml

@@ -1,33 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Entity parent="template_structure">
-  <BuildRestrictions>
-    <Category>Special</Category>
-  </BuildRestrictions>
-  <Footprint replace="">
-    <Circle radius="6.0"/>
-    <Height>5.0</Height>
-  </Footprint>
-  <Health>
-    <Max>200000</Max>
-  </Health>
-  <Identity>
-    <Civ>gaia</Civ>
-    <GenericName>Marker</GenericName>
-    <SpecificName>Marker</SpecificName>
-    <Icon>gaia/special_blank.png</Icon>
-  </Identity>
-  <Obstruction>
-    <Obstructions>
-      <Edge width="6" depth="6"/>
-    </Obstructions>
-  </Obstruction>
-  <Selectable>
-    <EditorOnly/>
-  </Selectable>
-  <Visibility>
-    <AlwaysVisible>true</AlwaysVisible>
-  </Visibility>
-  <VisualActor>
-    <Actor>props/special/common/marker_object_sound.xml</Actor>
-  </VisualActor>
-</Entity>