fix: use nullable inside of type converter repository

feat: store compiled fill functions in list type converter

fix: correctly receive nullable type in serialize

feat: store type converters in dictionary to speed up converting

fix: correctly return results from type converter repository

feat: add bool type converter

feat: add nullable type converter

fix: return correct result from object BaseTypeConverter.Deserialize

fix: allow to convert all enums using System.Convert class

feat: add char and string type converters

feat: allow nullables in converters

feat: add interfaces for serializers, converters

feat: add base packet types converting