fix(packets): nullability of family

fix(packets): make inv sub packets optional

fix(packets): make gidx family sub packet nullable, family icons optional

Merge branch 'main' of github.com:Rutherther/NosSmooth

feat(packets): make in non player unknown4, unknown5 optional

Merge pull request #52 from Rutherther/feat/optional-wrapper

Add optional wrapper

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

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

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

feat(packets): add pclear packet

feat(packets): fix pinit packet for various entity types