* Added request and response classes

* Tidied up more examples

* Added request and response classes

* Tidied up more examples

* Reworked some types

* Tidy up

* Removed unused file

* Tidy up

* Removed Headers type

* Tidy up

* Fixed tests

* Tidy up

* Tidy up

* Removed baretypes

* Made scope and message dicts

* Added basic auth example

* Added a context for an http request

* Moved errors to separate file

* Removed unwanted type aliases

* Relocated lifespan request

* Added context for web socket request

* Relocated websocket code

* Split out lifespan

* Moved http code

* Tidy up

* Tidy

* Relocated errors

* Reworked for asgi-typing

* Removed unwanted type alias

* Split out core application

* Tidy up

* Reworked exceptions

* Tidy up

* Tidy up

* Reworked the http response

* Reworked http instance

* Used named function

* Removed HttpError - as it was a bad idea

* alpha version bump

* Tidied up logging

* Tidy up logging

* Fixed body fetcher

* Updated examples

* Tidy up

* Updated the user guide

* Updated the tutorial

Co-authored-by: Rob Blackbourn <rob.blackbourn@gmail.com>