* oneshot channels instead of custom promises
* Future instead of handle_dispatch
* Even less copying
* Those explicit waits were a mistake, thanks, @tomusdrw
* No more unsafe polling
* Test for the new `is_done()` method
* Mark Futures as `#[must_use]`
* Solve most compilation warnings
* `try_ready!` is more ideomatic
* Turn spaces into tabs
* Documentation and visibility improvements
* Minor code style improvements
* Make Futures run on an explisit reactor
* Another round of code style issues
* Simplify ConfirmationReceiver type
* Flatten ConfirmationOutcome into a plain Result type
* Get rid of a separate `pending` set, it was a stupid idea
* Clarify `add_request` docs
* No need to reduce the scope of the mutex here
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