Separate pet and siege behaviour types.

src/engine/Enum.java

@@ -2846,7 +2846,8 @@ public class Enum {
         SpellAggroGrouperWimpy(Spell, true, false, true, false, false),
         //Independent Types
         SimpleStandingGuard(null, false, false, false, false, false),
-        Pet1(null, false, false, true, false, false),
+        Pet(null, false, false, true, false, false),
+        Siege(null, false, false, true, false, false),
         Simple(null, false, false, true, false, false),
         Helpee(null, false, true, true, false, true),
         HelpeeWimpy(null, true, false, true, false, false),