docs: add not in range, nullable wrapper docs

fix(packets): add missing constructor to PreqPacket

feat(packets): fix clist packet pets sub packet type

Merge pull request #51 from Rutherther/feat/easy-api

Add easy apis for various things

feat(packets): represent pet skill packet correctly, last parameters are map x, map y

feat(packets): add n_run for npc operations

feat(packets): add packet for moving through portals

feat(packets): add packets for managing inventory

Merge pull request #47 from Rutherther/feat/pass-nullable

Pass CanBeNull to string serializer and converter

feat(packets): update packets to not use nullable if not needed

feat(packets): add use partner skill packet

Merge pull request #45 from Rutherther/feat/mates

Add support for mates

fix(packets): correctly represent finfo

feat(packets): add nullable wrapper to represent a compoud type that may be null as a whole

chore(game): add missing documentation

feat(game): add mates processing

feat(game): add revive handling

fix(packets): finfo contains just one update

feat(packets): add party stat packet

feat(packets): add pet and partner skill packets