refactor: compose shared scenario event and item packs

resources/scenario/scenario_2220.json

@@ -1,5 +1,6 @@
 {
     "title": "【가상모드22】 찐유저무쌍!",
+    "extends": ["extensions/events/standard.json"],
     "startYear": 180,
     "history": ["<C>●</>180년 1월:<L><b>【가상모드22】</b>찐유저무쌍!</>", "<C>●</>180년 1월:<L><b>【이벤트】</b></>다 덤벼라! 유저가 최강이다!"],
     "stat": {
@@ -654,6 +655,5 @@
         [0, "Hide_D", null, 0, null, 39, 99, 75, 0, 160, 300, null, null]
     ],
     "general_ex": [],
-    "initialEvents": [],
-    "events": [["destroy_nation", 1000, ["and", ["Date", ">=", 183, 1], ["RemainNation", "==", 1]], ["BlockScoutAction"], ["DeleteEvent"]]]
+    "initialEvents": []
 }