[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/ItemUseAddSelectItem.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.game.props.ItemUseAction;
+
+import emu.grasscutter.game.props.ItemUseOp;
+
+public class ItemUseAddSelectItem extends ItemUseSelectItems {
+    @Override
+    public ItemUseOp getItemUseOp() {
+        return ItemUseOp.ITEM_USE_ADD_SELECT_ITEM;
+    }
+
+    public ItemUseAddSelectItem(String[] useParam) {
+        String[] options = useParam[0].split(",");
+        this.optionItemIds = new int[options.length];
+        for (int i = 0; i < options.length; i++) {
+            try {
+                this.optionItemIds[i] = Integer.parseInt(options[i]);
+            } catch (NumberFormatException ignored) {
+                this.optionItemIds[i] = INVALID;
+            }
+        };
+    }
+}