Vim control lines were re-introduced or not entirely cleaned up.
This nukes them again.
Removing from modules, netwerk, security, storage, testing, toolkit, and
a few scattered misc files. More to come.
Since these are just interpreted comments, there's 0 impact on actual code.
This removes all lines that match /* vim: set(.*)tw=80: */ with S&R -- there are
a few others scattered around which will be removed manually in a second part.
