범용성을 목적으로 LazyVarUpdater를 분리

hwe/sammo/WarUnitCity.php

@@ -137,10 +137,7 @@ class WarUnitCity extends WarUnit{
     
 
     function applyDB($db):bool{
-        $updateVals = [];
-        foreach(array_keys($this->updatedVar) as $key){
-            $updateVals[$key] = $this->raw[$key];
-        }
+        $updateVals = $this->getUpdatedValues();
 
         if(!$updateVals){
             return false;