package:web v0.5.0

• Redeprecate APIs that were deprecated in 0.4.1 but undeprecated in 0.4.2.
• Add support for dart fix migrations from dart:html classes to
  package:web classes.
• Contribute a markdown file for the renamed classes from dart:html to
  package:web (see renames.md).
• Migrate classes to use interop extension types that implement JSObject.
• Add generics to APIs that use JSArray and JSPromise. Typedefs of a Dart
  primitive type are instead replaced with their JS type equivalent if they
  appear as a type parameter in order to conform with the type bounds of
  JSArray and JSPromise.
• Changed record types to be JSObject instead of JSAny.
• Reduce the number of DOM APIs we generate code for. Currently, the API needs
  to be standards-track, and be supported by Safari, Chrome, and Firefox.
• Updated the source IDL version to 3.43.1.
• Deprecate a few type aliases in favor of their standardized versions:

  Deprecated	Preferred
  AudioElement	HTMLAudioElement
  HtmlElement	HTMLElement
  CanvasElement	HTMLCanvasElement
  ImageElement	HTMLImageElement
  VideoElement	HTMLVideoElement
  CssStyleDeclaration	CSSStyleDeclaration
  ContextEvent	WebGLContextEvent
  WebGL	WebGLRenderingContext

• Deprecate the top-level createElementTag, createCanvasElement,
  createIFrameElement, and querySelector functions.
  Instead, use the standard creation and query methods on document.
• Deprecate the client extension methods on MouseEvent and Touch.
  Instead, directly use the clientX and clientY properties.
• Deprecate the HttpRequest API borrowed from dart:html.
  Consider migrating to package:http instead.