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

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

fix: make lists at end of packet optional

chore: fix documentation

fix: mark in player sub packet family name as nullable

fix: move FamilyName to InPlayerSubPacket

fix: remove InnerSeparator from in subpackets

feat: enable inline converters in all packets

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

chore: renum Morph to MorphVNum

chore: remove NosCore dependency

feat: add in packet with all dependencies

feat: move move packet to entities namespace