Split filtered hints on non-word and hint characters.

This affects the scoring system for filtered link hits, and therefore
affects their usability.

Example link text:

    "We open all day", say 7Eleven

Previously:

    "We
    open
    all
    day",
    say
    7Eleven

With this PR:

    we
    open
    all
    day
    say
    Eleven

Previously: the typed text `we` and `day` would receive poor scores (not
the start of a word, and not a whole word.  Now, these get high scores,
so are more likely to be selected as the active link.  Also, `7Eleven`
cannot be typed (because `7` is a hint character).

With this PR, the typed text `we` `day` now get high scores, as they
should.

0 files changed, 0 insertions, 0 deletions