Refactor GameData, remove deprecated getGsonFactory

- Fix day-of-week dungeons
- AvatarSkill max level enforcement from excels
- Partial fix to bonus levels (need packet on talent update)

src/main/java/emu/grasscutter/game/dungeons/DungeonSystem.java

@@ -107,8 +107,6 @@ public class DungeonSystem extends BaseGameSystem {
     }
 
     public void updateDailyDungeons() {
-        for (ScenePointEntry entry : GameData.getScenePointEntries().values()) {
-            entry.getPointData().updateDailyDungeon();
-        }
+        GameData.getScenePointEntries().forEach((id, entry) -> entry.getPointData().updateDailyDungeon());
     }
 }