Survival Refightalized & Monsters Unbound 1.21.5

[TheThanathor]

This PR serves to replace Combat Expanded with Survival Refightalized & Monsters Unbound. The last part, named Augmented Armor is not included here, this is as replacement of the old PR (#1025)

Survival Refightalized

• Reworks Armor points to serve as a "second health bar". Armor points regenerate quickly out of combat
• Reworks Health regeneration to only work out of combat. It also no longer consumes saturation.
• Rebalances Shields to be temporarily disabled after an attack, and adds a parry mechanic
• Rebalances mobs to be stronger based on environment (like deeper underground)

Monsters Unbound

• Adds custom mob modifiers in different biomes
• Adds special Elite mob variants that are much stronger