Implement Shield (wip)

[pandaa-be]

Introduction

This PR adds working shield.

this will have a lot of commits because i am working on 2 different desktops and this is the best way for me to save the files sry bros

Changes

API changes

VanillaItems::SHIELD()
Item::canDisableShield() in Item.php & Axe.php

Tests

I tested this PR by doing the following (tick all that apply):

• Playtesting using a Minecraft client (provide screenshots or a video)

[JavierLeon9966]

Instead of naming the methods and properties breakShield it should be like "shield disabled". canDisableShield, isShieldDisabled, getShieldDisableCooldown, etc.