Fix #11115: remove boolHook (where feasible)

[gibson042]

This one is much less clear-cut than #12600, upon which it depends. It's just a matter of picking inconsistencies: because IE<8 is incapable of differentiating the relevant properties and attributes, the oldest of the oldIEs must necessarily get left behind in order to correctly draw a distinction between boolean them.

If we accept this, it means that modern browsers and IE8+ will correctly interpret selectors referencing boolean attributes from jQuery 1.9 on, and most of this code will be removed in jQuery 2.0.

If we don't, we either commit to incorrectly interpreting those selectors indefinitely or we introduce this as a documented inconsistency between 1.9 and 2.0.

IOW: ROCKjQueryHARD PLACE

Sizes - compared to 12600 @ f9e0e510cb01daab6348e849fbec6836060190d4

    263891      (+216)  dist/jquery.js                                         
     92218       (+74)  dist/jquery.min.js                                     
     32588       (+24)  dist/jquery.min.js.gz

[dmethvin]

Per @timmywil's idea, waiting for a rewrite using .default* properties. You can either tack on this pull or create a new one.

[dmethvin]

Looking pretty good so far, what are your remaining concerns?

[gibson042]

No more concerns; just a bit of work to get it functioning the same on IE<8, IE8, and everything else. I suppose it could land now if we need it to.

[dmethvin]

Okay, I may be back later tonight and can look at it then depending on how much eggnog I have nogged.