fix: make family id nullable in family

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

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

chore: fix documentation

fix: move FamilyName to InPlayerSubPacket

feat: enable inline converters in all packets

feat: add packets (ncif, u_as, pusle, msg, say, st, stat, c_mode, lev, ski, sr)

feat: add in packet with all dependencies