Created branch with proposed wording for 1.3.4

I've created a branch to propose Andrew/Alastair/Jake's wording arranged
with bullets. I think it's much easier to parse, to help with Detlev's
concern... I'd like to see if this Hail Mary pass will address all
comments.

http://rawgit.com/w3c/wcag21/1.3.4_autofill_david/guidelines/#identify-common-purpose

I've imported the HTML 5.2 list.

Here's the wording:
====

The purpose of common interface components can be programmatically
determined if the following are true:

​- ​
The content is implemented using technologies that support identifying the
expected purpose for interface components
​- ​
The Interface component has a purpose that maps to the list of
​[internal link] ​
common interface components

​===​



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