HypixelStorage | Custom ec, backpack v1.0.1-STABLEVERSION

## HypixelStorage v1.0.1

This update focuses on Backpack item usability and custom item support.

### Added
- Backpack items can now open backpacks directly with right-click.
- Added automatic backpack slot linking for given backpack items.
- Added configurable Backpack item behavior in config.yml.
- Added CustomModelData support for Backpack items.
- Added Nexo item support through nexo-id.
- Added Oraxen compatibility fallback for custom items.
- Added new configurable messages for Backpack item opening and linking.

### Fixed
- Fixed /hypixelstorage givebackpack <player> <type> items not doing anything when used.
- Fixed Backpack items requiring /storage instead of being usable directly.
- Fixed CustomModelData 0 handling, now 0 means disabled.

### Config
New section added:

```yaml
settings:
backpack-item-open:
enabled: true
create-missing-storage: true
use-storage-slots-first: true
allow-virtual-slots: true
virtual-slot-start: 1000
bind-item-to-slot: true
prefer-existing-type: true
send-created-message: true
send-open-message: false

Backpack items now support:

custom-model-data: 0
nexo-id: ''

Existing users should merge the new config and messages into their current files.