[css-content] Restructuring CSS Generated Content

It's time to de-outofdatify CSS Generated Content Module Level 3 [1] . I've
been working through it, converting it to Bikeshed, removing sections that
are now in other specs, and putting in refugee sections from GCPM. Nothing
has been pushed yet.

Here are some of the changes I'm contemplating, some of which may require
WG resolutions. I'll add this as an agenda item to our next telecon.

A. Removing the section on pseudo-elements, as that's now it's own spec.

B. Removing the counters and numbering section, as that's now in css-lists.

C. Replacing the section on named strings with the corresponding section
from GCPM.

D. Adding leaders, x-refs, and bookmarks from GCPM per WG resolution.

E. The icon property is both here and in CSS-UI, and is marked at-risk
there. Should I delete it here, or should it move from CSS-UI?

F. Things like content: square are in this draft, and at least one of the
PDF formatters supports them.But the way they are defined is actively
anti-interoperable (the suggestions for square include three different
unicode characters).  Should this be deleted?

G. All material related to 'pending', 'move-to', and such hasn't been
expunged from the document yet, but will be.

H. Ian Hickson, Håkon Lie, and Fantasai are listed as editors. Both Hixie
and Håkon are fine with being promoted to former editor.

Thanks,

Dave Cramer

[1] http://dev.w3.org/csswg/css-content/