More Texture Changes from Damage

In 1.14, they added iron golem texture changes depending on the golem's health. This was really cool. I think we should go further and add this for a lot more mobs. I think skelatons should start losing bones, guardians will lose spikes, blazes will smoke more, shulker shells crack, etc. This would be extremely helpful for new players who don't understand the health system just yet and also just adding more detail for players of all skill.