refactor: compose shared scenario event and item packs

resources/scenario/scenario_2500.json

@@ -1,5 +1,6 @@
 {
     "title": "【가상모드25】 악질유저무쌍!",
+    "extends": ["extensions/events/standard.json"],
     "startYear": 180,
     "history": ["<C>●</>180년 1월:<L><b>【가상모드25】</b>악질유저무쌍!</>", "<C>●</>180년 1월:<L><b>【이벤트】</b></>최고의 악질유저를 가려라!"],
     "stat": {
@@ -711,6 +712,5 @@
         [0, "Cure", null, 0, null, 92, 92, 55, 0, 160, 300, null, null],
         [0, "40장로", null, 0, null, 85, 85, 85, 0, 160, 300, null, null]
     ],
-    "initialEvents": [],
-    "events": [["destroy_nation", 1000, ["and", ["Date", ">=", 183, 1], ["RemainNation", "==", 1]], ["BlockScoutAction"], ["DeleteEvent"]]]
+    "initialEvents": []
 }