[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/ItemUseGainFlycloak.java

@@ -0,0 +1,20 @@
+package emu.grasscutter.game.props.ItemUseAction;
+
+import emu.grasscutter.game.props.ItemUseOp;
+
+public class ItemUseGainFlycloak extends ItemUseInt {
+    @Override
+    public ItemUseOp getItemUseOp() {
+        return ItemUseOp.ITEM_USE_GAIN_FLYCLOAK;
+    }
+
+    public ItemUseGainFlycloak(String[] useParam) {
+        super(useParam);
+    }
+
+    @Override
+    public boolean useItem(UseItemParams params) {
+        params.player.getInventory().addItem(this.i);  // TODO: Currently this returns false for all virtual items - need to have a proper success/fail
+        return true;
+    }
+}