feat: split packets definitions into separate assembly

chore: add documentation for packets say, in player, cinfo

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

fix: mark in player sub packet family name as nullable

fix: move FamilyName to InPlayerSubPacket

feat: enable inline converters in all packets

chore: renum Morph to MorphVNum

feat: add in packet with all dependencies