feat: accept types and variable names in inline converter generators instead of packet parameters

feat: add extensions for checking type nullability

feat: use StringBuilder Append overloads

feat: split inline generated deserialization into different methods

doc: add documentation for missing parameter in packet info

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

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

feat: add client SayPacket

fix: use correct separators for skill sub packet

fix: make lists at end of packet optional

fix: add namespace prefix to generated files

chore: fix documentation

chore: remove debug generator write to temp

fix: mark in player sub packet family name as nullable

fix: handle null string inline serializer correctly

fix: replace with parent separator on level pop in packet string builder

fix: move FamilyName to InPlayerSubPacket

fix: remove InnerSeparator from in subpackets

fix: support +10 upgrade in UpgradeRareSubPacket

fix: check for null after popping the string enumerator level