feat(packets): make prepared level part of CurrentLevel in PacketStringBuilder similar to PacketStringEnumerator

feat: split packets definitions into separate assembly

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

Add generation of packet list inline serializer

feat: use StringBuilder Append overloads

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

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

feat: do not remove prepared level on pop level

feat: add base packet types converting