For now, the internal equivalent of "iskeyword" is [^\s'"].
In the future, the internal "iskeyword" equivalent can be expanded. It may
be overboard to add an "iskeyword" option, as it applies to lots more
things than :abbr. Additionally, it's not clear why it's bad to call
keyword characters everything except whitespace and quotes.
TODO: Should abbreviations be triggered by any non-keyword character?
TODO: Should abbreviations be triggered by <CR>?
TODO: Should abbreviations be able to include <Left>, etc.?
Most of the special case asciidoc replacements were also removed since
they're a bit confusing and doing so results in a 60% improvement in the
time taken by asciidoc to process the help pages. Unfortunately, I'm
now limited to preparing a three course menu for my guests while it runs
rather than the degustation extravaganzas of the past but such is life.
It's still a bit of a mess but since we're almost certainly moving to
something else in the near future it's probably not worth cleaning it up
before 2.0 is released.
