Shield Stuff & Unpushable Shields

[Geevies]

• Shields (Riot, Buckler, Energy, Tactical, Changeling) now block attacks 100% of the time, until their durability gets reduced to 0.
• Shields now have durability and armour. Damage taken gets reduced by the shields armor, and then lowers the durability. Durability can be re-added by either repairing the shield, or waiting for it to recharge, if it's an energy shield.
• Shields now block damage from simple mobs even if the damage is over 15.

https://github.com/user-attachments/assets/554b9718-89a7-4825-b015-c95924e10268

• Shields held in your hand now guarantee that you cannot be pushed. Energy and tactical shields only prevent pushing when they're deployed / active.