CI-mingw

added `FileStreamBuffered` to reduce the amount of `fgetc()` calls #203

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Run time

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Job	Run time
build (g++, MINGW32)	3m 51s
build (g++, MINGW64)	4m 11s
build (clang++, MINGW64)	3m 8s
build (clang++, CLANG64)	4m 33s
	15m 43s