Fix issues with han siege tower

reported by @Langbart ; Fixes #6503 , also adjusts the footprint to fit
better to the actor

comments by: @Stan
accepted by : @phosit


Differential revision: https://code.wildfiregames.com/D4655
This was SVN commit r26897.

binaries/data/mods/public/art/actors/structures/han/siege_tower.xml

@@ -16,15 +16,13 @@
       </textures>
       <animations>
         <animation file="mechanical/han_siege_tower_idle.dae" name="idle" speed="100"/>
-        <animation file="mechanical/han_siege_tower_attack.dae" load="0.5" name="attack_ranged" speed="100"/>
-        <animation file="mechanical/han_siege_tower_attack.dae" name="attack_melee" speed="100"/>
         <animation file="mechanical/han_siege_tower_walk.dae" name="walk" speed="15"/>
         <animation file="mechanical/han_siege_tower_walk.dae" name="run" speed="24"/>
       </animations>
     </variant>
   </group>
   <group>
-    <variant frequency="100" name="Idle"/>
+    <variant frequency="100" name="ungarrisoned"/>
     <variant name="garrisoned">
       <props>
         <prop actor="props/special/common/garrison_flag_han.xml" attachpoint="garrisoned"/>

binaries/data/mods/public/art/actors/structures/hellenes/siege_tower.xml

@@ -7,7 +7,6 @@
         <animation file="mechanical/hele_siege_tower_idle.dae" name="Idle" speed="15"/>
         <animation file="mechanical/hele_siege_tower_move.dae" name="Walk" speed="15"/>
         <animation file="mechanical/hele_siege_tower_move.dae" name="Run" speed="24"/>
-        <animation event="0.5" load="0.0" name="attack_ranged" speed="100"/>
       </animations>
       <mesh>structural/hele_siege_tower.dae</mesh>
       <props>

binaries/data/mods/public/simulation/templates/units/han/siege_tower.xml

@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_unit_siege_tower">
+  <Footprint replace="">
+    <Square width="9.0" depth="9.0"/>
+    <Height>30.0</Height>
+  </Footprint>
   <Identity>
     <Civ>han</Civ>
     <SpecificName>Gōngchéng Tǎ</SpecificName>