Remove gen3 egg location hashset; only paths that reach it are for hatched eggs or current breed-eggs. Check breed eggs with the singular met location.
Simplify some logic flow
held item list now allocates less (concat arrays instead of ienumerables)
item list already prunes out of range items, so simplify data source fetch
simplify item list prune (return as list, so we can call RemoveAll instead of Where.ToList)
