Edit documents as YAML

[EpicWink]

YAML is a nicer language to edit JSON-structured data. I propose a user setting to switch the editor to displaying the documents as YAML.

This YAML would be converted to JSON for saving and converted from JSON for loading by a client-side library. The choice of this library will determine the feature-set (eg forward-references), but obviously JSON-compatible (no custom types or dates, no directives nor productions, tags will be dropped, single-document). Quick search of JS libraries:

• yaml
• js-yaml

I can start a PR when my company accepts the CLA