Add `:qa:os` and `:benchmarks` to the list of automatically formatted
projects, and apply some manual fix-ups to polish it up.
In particular, I noticed that `Files.write(...)` when passed a list will
automaticaly apply a UTF-8 encoding and write a newline after each line,
making it easier to use than FileUtils.append. It's even available from
1.8.
Also, in the Allocators class, a number of methods declared thrown exceptions that IntelliJ reported were never thrown, and as far as I could see this is true, so I removed the exceptions.