Fix something and implement weapon entities

src/main/java/emu/grasscutter/data/excels/codex/CodexWeaponData.java

@@ -8,6 +8,7 @@ import emu.grasscutter.data.ResourceType;
 public class CodexWeaponData extends GameResource {
     private int Id;
     private int weaponId;
+    private int gadgetId;
     private int sortOrder;
 
     public int getSortOrder() {
@@ -18,6 +19,10 @@ public class CodexWeaponData extends GameResource {
         return weaponId;
     }
 
+    public int getGadgetId() {
+        return weaponId;
+    }
+
     public int getId() {
         return Id;
     }