Prep work for pspFileSystem and two small fixes

I think we already use pspFileSystem from other threads, so this should be a good thing anyway.  Since IO is slow, I went with the lock everything approach.

Slipped in fixes for two issues with savestates (filesystems not unmount on loadexec and not running while paused), as well as adds another function to sceCcc since they were small.

-[Unknown]