Add OnWarehouseReady hook, make Some SpawnCrate Args Optional

[FragileDeviations]

Rotation, scale, ignore policy, and spawnaction are now optional

Rotation defaults to (0, 0, 0, 1)
Scale defaults to (1, 1, 1)
IgnorePolicy defaults to false
SpawnAction defaults to null

You don't really need to specify these, mainly just the crate/barcode and position, so they're now optional.