CI-mingw

added `FileStreamBuffered` to reduce the amount of `fgetc()` calls #200

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Run time

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Job	Run time
build (clang++, MINGW64)	2m 23s
build (clang++, CLANG64)	2m 16s
build (g++, MINGW32)	2m 16s
build (g++, MINGW64)	2m 0s
	8m 55s