Merge #671

671: Makre VFS slightly less super obscure r=vemoo a=matklad

I've decided to better understand what we do in VFS, and this turns out to be really hard. Jugling threads and channels is one of the most unfortunately arcane bits of rust...

I had some success though by flattenning the structure so that all channel & thread creation routines are on one screen.

r? @vemoo

Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>