[BREAKING] Item Usage Overhaul

-De-hardcode elemental orb values
-De-hardcode exp items
-Change ShopChest format (temporary, drop system overhaul will replace it entirely)
-Food healing actually uses Ability data for real HP amounts

src/main/java/emu/grasscutter/data/excels/BuffData.java

@@ -13,6 +13,8 @@ public class BuffData extends GameResource {
     private float time;
     private boolean isPersistent;
     private ServerBuffType serverBuffType;
+    private String abilityName;
+    private String modifierName;
 
     @Override
     public int getId() {