Revert "feat: use "in" instead of "ref" in packet serializer"

This reverts commit ae1b3301e659c237a10f742675e1f8db9389d2db.

feat: use "in" instead of "ref" in packet serializer

Merge pull request #47 from Rutherther/feat/pass-nullable

Pass CanBeNull to string serializer and converter

feat(packets): pass nullable to packet serializers

fix(packets): syntax error in generator

fix(packets): deserialize strings starting with "-" correctly

feat: split packets definitions into separate assembly

Merge pull request #14 from Rutherther/packets-span

Rewrite packets string enumerator to use spans, add Injector for .NET 5+

fix: serialize "-" as null string

feat: use ReadOnlySpan in inline deserializers

feat: use ReadOnlySpan for deserialization instead of strings

Merge pull request #16 from Rutherther/packets-list-inline-serializer

Add generation of packet list inline serializer

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

feat: split inline generated deserialization into different methods

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

fix: handle null string inline serializer correctly

chore: rename type generators to inline converter generators

feat: add inline packet converters generation support