switch dfVFS to use alternative MBR implementation instead of libtsk - pystk/libtsk provides no distinction between slots and partitions https://github.com/log2timeline/dfvfs/issues/578 - pystk/libtsk provides no means to determine disk identity/identifier https://github.com/py4n6/pytsk/issues/83 - issues with detecting 4k sector size MBR https://github.com/log2timeline/dfvfs/issues/45