[mofr]

Stacked on #345.

What

• winter.web.WebApplication(modules, injector, interceptors) replaces winter.application.Application: the code of a web application, its injector and the classes of its interceptors, in the order they run. add(definition) and definitions stay as they were.
• Interceptors belong to applications. The injector of each request creates them, so their dependencies go to __init__; create_urls checks the arguments of their pre_handle on startup. An instance or a class that is not an Interceptor fails construction.
• winter.web.interceptor_registry and InterceptorRegistry are gone.
• winter.application keeps the scan as find_definitions(modules). modules has no default any more: the frame-based "caller directory" broke once the scan is called from inside Winter, and its __main__ special case goes with it.
• winter.django.create_urls, winter.openapi.generate_openapi, serve_spec and serve_swagger_ui take a WebApplication.

Why

The consumer has three global interceptors. Their order matters in two places and comes from INSTALLED_APPS, and two of them limit themselves to one service's endpoints by matching the path. A per-application ordered list states the order and removes the path filters.

Tests

• tests/test_application_scope.py: an interceptor of one application does not run in another.
• tests/web/test_interceptors.py: interceptors run in the given order, with dependencies from the injector.
• tests/application/test_definitions.py and tests/web/test_web_application.py split the old Application tests.

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