* Fixed a bug in the lexer where an error would be raised if
characters not allowed in tag shorthands are used in local tags
* Fixed processing of object tags for all kinds of root nodes in Parser
* Improved dumper to output a space after a local tag
* Renamed some enumeration types to conform better to the YAML spec
* Added secondaryPrefix to YamlTagLibrary
* Added possibility to control tag output style independently from
presentation style in serializer
* Created local tags for all types that are serialized and use them in
construction and serialization
* Better JSON serialization (map bool literals to true/false if
possible)
* Fixed a problem where the tag of block sequence would be
wrongly placed
* Always output "" when dumping empty strings
* Added helper functions to create YamlStreamEvents.
* Moved procs for YamlStreamEvents to private/events.nim
* renamed dump() to present()
* Added dump() and load() to yaml.serialization