OAS 3.0: Styles for deprecated parameters

[hkosova]

Version: ft/oas3 branch

In 3.0 specs, deprecated parameters are rendered like regular parameters. They probably need a different style, similar to deprecated operations and models.

Spec:

openapi: 3.0.0
info:
  version: 0.0.0
  title: test
paths:
  /:
    get:
      parameters:
        - in: query
          name: param
          schema:
            type: string
        - in: query
          name: deprecated_param
          deprecated: true
          schema:
            type: string
      responses:
        '200':
          description: OK