Multi-file plot.bin wrapper

[nazar-pc]

Right now we have a problem on Windows: due to NTFS file system that triggers full write of the file we disable plot cache on large farms and even for small farms writing of a couple terabytes takes a really long time.

We can do an annoying thing and split plot.bin into multiple files, let's say 100G each and create a wrapper data structure similar to DirectIoFile that will allow to transparently read and write contents as if it was a single file.

This way we constrain writes to just one file worth of space at a time and improve UX for Windows users.