* Presenter now tries to write style given in event
* Can write single quoted
* several fixes to line length handling
* sever other presenter fixes
* updated server deps
* updated server code to use new presenter features
(or rather, not use, as the server *should* alter the
input style instead of outputting it as-is)
* 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
