[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/game/props/ItemUseAction/ItemUseAddCurHp.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.game.props.ItemUseAction;
+
+import emu.grasscutter.game.props.ItemUseOp;
+
+public class ItemUseAddCurHp extends ItemUseInt {
+    private String icon;
+
+    @Override
+    public ItemUseOp getItemUseOp() {
+        return ItemUseOp.ITEM_USE_ADD_CUR_HP;
+    }
+
+    public ItemUseAddCurHp(String[] useParam) {
+        super(useParam);
+        this.icon = useParam[1];
+    }
+
+    @Override
+    public boolean useItem(UseItemParams params) {
+        return (params.targetAvatar.getAsEntity().heal(params.count * this.i) > 0.01);
+    }
+}