Build

Implement fuse load and save from/to file #154

Job	Run time
linux-x86_64	2m 5s
linux-x86_64-autotools	1m 37s
macos-x86_64	1m 39s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 24s
mingw (mingw64, x86_64)	4m 31s
msvc (x86, Win32)	2m 38s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 35s
mingw (ucrt64, ucrt-x86_64)	4m 42s
msvc (x64, x64)	3m 4s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 19s
mingw (clang64, clang-x86_64)	3m 3s
	27m 37s

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