Code Inspection: Deprecated YAML key

Reports deprecated keys in YAML files.

Deprecation is checked only if there exists a JSON schema associated with the corresponding YAML file.

Note that the deprecation mechanism is not defined in the JSON Schema specification yet, and this inspection uses a non-standard deprecationMessage extension.

Scheme deprecation example:

{
  "properties": {
    "SomeDeprecatedProperty": {
      "deprecationMessage": "Baz",
      "description": "Foo bar"
    }
  }
}

The following is an example with the corresponding warning:

SomeDeprecatedProperty: some value

See YAML for details.