Varied Mob Sizes

Adds size variety to Minecraft creatures: half-size and double-size zombies that match their replacement target mob (spawn during normal mob generation and significantly preserve gameplay balance).

Also includes an optional percentage-based size adjustment for any mob with NBT spawn data. NBT can be modified using the data merge entity command, in the datapack root, or programmatically.

Optimization with potato PC FPS boost packs is recommended and can be used alongside Resurgence Resource Pack.