CI-mingw

added `constness_ptr` as pointer wrapper to ensure actual method constness #239

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Run time

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Job	Run time
build (g++, MINGW64)	2m 17s
build (g++, MINGW32)	3m 6s
build (clang++, CLANG64)	2m 13s
build (clang++, MINGW64)	2m 33s
	10m 9s