* Switch TestEngineBase to mockserver.
* Split mockserver.py.
* Stop using WrappingFactory.
* Remove keyfile/certfile fields from TestHttpBase.
* Move webclient-only resources to test_webclient.py.
* Refactor MockServer.url().
* Migrate TestHttpBase to mockserver.
* Migrate TestSimpleHttpsBase to a separate mockserver.
* Rename TestHttpMockServerBase.
* Migrate TestHttpProxyBase to a separate mockserver.
* Refactor HTTP mockservers.
* Remove ProcessTest and SiteTest.
* Restore the support for Windows line endings in TestParseCommand.
* Add a test for running a scrapy command in a project subdir.
* Remove pywin32 from test deps.
Andrey Rakhmatullin
Adrián Chaves