PolyNav is 100% now.

Unused prefabs such as Pack and Leader Zombies have been moved. They
still use the old ZombieMovement2, though. If we want to use them again,
we will have to update them to use PolyNav agents. See normalZombie and
bossZombie to understand what scripts go where.

If you're using a 64-bit OS, I made an build for it. Just saying.
Removal of script.