CI-mingw

added `FileStreamBuffered` to reduce the amount of `fgetc()` calls #201

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Run time

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Job	Run time
build (clang++, CLANG64)	2m 38s
build (g++, MINGW64)	2m 31s
build (g++, MINGW32)	2m 32s
build (clang++, MINGW64)	2m 26s
	10m 7s