…1440)

* Add support to get notified when a JSON node is expanded/collapsed.

  * Added onExpand callback option to be passed while creating JSONEditor
  * The callback is invoked when the expand/collapse is done non-programatically

* Add API to expand/collapse a given node

  * Added JSONEditor.expand() method

* Add example to demostrate syncing expanded nodes across editors

  * Added examples/25_sync_node_expand.html

* textnode autocomplete by schema:
Adding ext-language_tools
Adding example
Start SchemaTextCompleter

* start processing schema:
simple props
primitives - string, number
enums

* text completion - handle boolean and refs

* integrate current suggestions to completion api

* autocomplete by schema: of-condition support

* autocomplete by schema:array support

* add allowSchemaSuggestions to valid options list

* optimize suggestions

* refactor suggessions process to enable schames with recursicve refs

* handling suggesion duplications

* code cleanup

* wrap async execution with a function

* add allowSchemaSuggestions to api.md

* some md fixes

* another md fix

* SchemaTextCompleter: doc and typos

* update sutocomplete example description

* typos

* remove yarn.lock

* [schema autocomplete] handle schema change

* a unit test for utils.uniqueMergeArrays functionality

* base SchemaTextCompleter unit test

* SchemaTextCompleter integration test

* remove redundant autocomplete config