allow generic sequence of poller events

[typon]

To avoid allocating (due to std::vector), I would like to use a static array for creating poller events. However, the wait_all method currently is hardcoded to accept only vectors. This PR addresses that by making wait_all a templated function.

[coveralls]

Pull Request Test Coverage Report for Build 6660279595

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.965%

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Totals
Change from base Build 6182865435:	0.0%
Covered Lines:	854
Relevant Lines:	982

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💛 - Coveralls

[gummif]

Nice, thanks.