weissi remove ugly and unnecessary ignore result (_ = ...) (#652)
Motivation:

_ = expression() is ugly and in many cases unimportant. In fact we train
ourselves to overread it which makes special cases where you'd actually
expect a result to be used just look normal.

Modifications:

remove _ = from a lot of places. In many cases we already had a better
(and sometimes cheaper way) to not return a value but in some cases
(mostly `remove` functions) I added `@discardableResult`

Result:

NIO source code looks nicer
Latest commit 08ab8b5 Nov 13, 2018
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