Veyas Hardcore Mobs - Zombies

- The /vhmzsetmutationstage command has been added. Setting a mutation stage also resets the timer for the next mutation.

- Fleshspire particles now fall more slowly (gravity reduced from 0.25 to 0.05), spawn less frequently (10% rate), and zombies affected by Fleshspire now emit smoke.

- Above 20 mutation stages, zombies’ health per mutation is decreased by 75%. At 50 stages, this progression stops.
- At certain mutation stage thresholds like 75, 100, 125, 150, etc. - zombies gain small additional health bonuses, reaching up to 180% health at 1000 mutation stages.
- Zombies will randomly attack and kill nearby entities like illagers and animals. This feature isn’t enabled by default — it must be turned on using a Gamerule. There’s also another Gamerule that lets zombies attack monsters as well.