JSON in the monaco editor

[aeschli]

• @chrmarti
• clone https://github.com/Microsoft/monaco-editor
• npm install
• npm run simpleserver and open http://localhost:8080/monaco-editor/test
• open and edit the json sample
• validate:
  • syntax errors
  • schema-driven validation:
    Note, the standalone editor sample editor page can not fetch any remote schemas. The only schema available is currently the schema-schema.
    Create a json file with "$schema": "http://json-schema.org/draft-04/schema#"
• hover
• code completion
• symbol information (outline)
• format
• https://code.visualstudio.com/docs/languages/json has more information on the various features