utf_info.cxx imported from 1.4.1 upstream.
Also moved unicode_info struct to the header to fix bustage with compiling the
new utf_info.cxx.
I've also gone ahead and deunified this new shared library as unified building
is busting in hunspell.cxx, complaining about config.h not being found. Weird
that it only happens in unified mode.
This reduces libxul size on all platforms by ~200 KB.
Since keypress is no longer triggered on all keypresses in content,
the spellchecker would potentially not be triggered when it should be.
This changes the trigger to keydown, instead.
No behavioral changes otherwise.
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.
