Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

feat: add inline packet converters generation support

feat: add support for conditional packet attribute

feat: add packet greedy attribute

feat: add support for optional parameters

feat: make list separator char

feat: add possibility to add fixed length for packet lists

feat: allow packet attributes only on parameters

fix: make InnerSeparator, AfterSeparator non nullable

feat: add base packet types converting