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.
KeyFrameEffect and KeyFrameEffectReadOnly are still built unified as
buddies because they have some complex interdependency that couldn't
easily be resolved without linking failures.
Issue #55
part 1 - Add transitioncancel event handler
part 2 - Add ontransitioncancel EventHandler to WebIDL
part 3 - Add member of active time to ComputedTiming