allow generic sequence of poller events #125

Job	Run time
tests (ubuntu-20.04, 98, gcc-10, g++-10, ON, 4.3.4, cmake)	1m 1s
tests (ubuntu-20.04, 11, gcc-10, g++-10, ON, 4.3.4, cmake)	59s
tests (ubuntu-20.04, 20, gcc-10, g++-10, ON, 4.3.4, cmake)	1m 26s
tests (ubuntu-20.04, 11, gcc-9, g++-9, OFF, 4.2.0, pkgconfig)	1m 57s
tests (ubuntu-22.04, 20, gcc-11, g++-11, OFF, 4.3.4, cmake)	1m 9s
tests (ubuntu-20.04, 17, gcc-9, g++-9, ON, 4.3.4, cmake, -DCOVERAGE=ON, lcov)	1m 36s
tests (ubuntu-20.04, 17, clang-12, clang++-12, ON, 4.3.4, cmake)	1m 3s
tests (macos-latest, 17, clang, clang++, OFF, 4.3.4, false, zeromq)	1m 1s
tests (windows-2019, 14, msbuild, msbuild, ON, 4.3.4, cmake, -Ax64)	3m 30s
tests (windows-2022, 20, msbuild, msbuild, ON, 4.3.4, cmake, -Ax64)	4m 24s
	18m 6s

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