Update 2021-06-30

Implemented items

• player can now buy/equip/unequip items
• items has power/skill buff

Quicker bleeding speed

added a exponent at "wound" parameter to make bleeding quuicker:
blood loss = (1 - (arteryHealth /  arteryMaxHealth)^1.5) * bloodDistribution

Balance adjustments

• sub-parts now have lower health, higher shield.
• dodge is now much harder to pull off
• raise the feeling of pain and dizzy