* submodule docs are now located at /api/yaml/<name>.html instead of
/api/<name>.html.
* can now simply link to symbols in other modules.
* fixed some links
* fixed quickstart example list
* added quickstart item displaying the new style api
* fixed a bug in presenter that doubled a line in literal/flow style
* moved load procs to yaml/loading.nim
* moved input YamlStream into ConstructionContext
* made ConstructionContext a non-ref object
* harmonized code style & comments
* renamed yaml/serialization.nim to yaml/native.nim
* removed default value objects,
use Nim2 default vaules for fields instead.
* moved dump procs to yaml/dumping and introduced Dumper
* modified serialization procs to use ctx as first argument,
so that prefix calls can be used
* changed defaults for presentation to be more like other
YAML implementations, e.g. no directives by default.
* Removed deprecated procs in DOM API
* Removed PresentationStyle – use the setXStyle procs of Dumper
instead.
* Fixed some warnings emerging from transitioning to Nim2
* NimYAML now uses the tag prefix tag:nimyaml.org,2016:
* That tag handle is shortened to !n! when presenting
* Also fixed some minor bugs dealing with tag handles