Issue #2792817 by Wim Leers, dawehner: BigPipe decorates html_response.attachments_processor, but uses an inner name based on the decorated service, which can cause problems

Issue #2702001 by olafkarsten, Wim Leers: Inject config factory for BigPipe (including in exception handlers)

Issue #2469431 by Wim Leers, Fabianx, swentel, nod_, yched, dawehner, tstoeckler, catch, borisson_: BigPipe for auth users: first send+render the cheap parts of the page, then the expensive parts