Fix duplicate generated class names (#8)

Thanks to @Pyrofab for fixing this before I got a notification about it!

src/main/java/ladysnake/dissolution/common/entity/PossessableEntityFactory.java

@@ -108,7 +108,7 @@ public static <T extends EntityLivingBase & IPossessable> T createPossessableEnt
     }
 
     private static String getName(Class baseClass) {
-        return String.format("%s_%s", EntityPossessableImpl.class.getName(), baseClass.getSimpleName());
+        return String.format("%s_%s_%s", EntityPossessableImpl.class.getName(), baseClass.getSimpleName(), baseClass.getName().hashCode());
     }
 
     /**