[mofr]

Stacked on #344.

What

• An argument of an API method, an interceptor's pre_handle or an exception handler is either mapped from the request by Winter's fixed resolvers (path, query, @query_parameters, @request_body, @request_header, ResponseHeader[T], PagePosition) or taken from the injector of the request.
• The injector of a request is a child of the application's injector, created in handle_request. It binds winter.web.Request and what the adapter gives (the Django adapter: django.http.HttpRequest).
• @winter.web.request_scope marks a provider whose value is created once per request; outside a request it raises LookupError.
• A type taken from the injector must have an explicit binding in it or its parents. Otherwise create_urls fails with TypeError (interceptors registered after that fail on the request). An auto-created object is not enough: a forgotten @request_body would become an empty object.
• Application no longer calls set_injector.

Removed

• ArgumentResolver, ArgumentsResolver, arguments_resolver, RequestBodyArgumentResolver, ResponseHeaderArgumentResolver, winter.web.pagination.PagePositionArgumentResolver, winter.django.HttpRequestArgumentResolver. A resolver of a type becomes a provider of that type marked @winter.web.request_scope.
• The response_headers argument of exception handlers: they declare ResponseHeader[T] with @winter.web.response_header, as API methods do.

Tests

• tests/test_application_scope.py: one API in two applications gets its argument from the injector of each.
• tests/web/test_request_scope.py: one value per request, shared by the interceptor and the API method; startup failures.
• Arguments that used to fail on the first request now fail on startup, so the endpoints that tested the lazy failure are gone.

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