VaultarHUD

Added detection of items in player backpacks/satchels etc (using VaultHunters' InventoryUtil class)

• Note because this detection is client-side, you need to actually open the backpack/satchel to update the count
• If a container has a "Hold shift to preview contents" option in your inventory (e.g. hovering over backpacks or shulkers) this will also work to refresh the count.