Imports
- github.com/df-mc/worldupgrader/blockupgrader
- github.com/df-mc/worldupgrader/itemupgrader
- github.com/sandertv/gophertunnel/minecraft/nbt
- github.com/sandertv/gophertunnel/minecraft/protocol
- github.com/segmentio/fasthash/fnv1
- golang.org/x/exp/maps