Add an index of methods and IDL attributes

See https://www.w3.org/Bugs/Public/show_bug.cgi?id=17898

 #0   contributor@whatwg.org                          2011-08-24 09:09:47 +0000 
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Specification: http://www.whatwg.org/specs/web-apps/current-work/complete/timers.html
Multipage: http://www.whatwg.org/C#custom-handlers
Complete: http://www.whatwg.org/c#custom-handlers

Comment:
Make "registerProtocolHandler" and "registerContentHandler" appear in the TOC

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 #1   Ian 'Hixie' Hickson                             2011-10-12 19:04:44 +0000 
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Why? Or even, how? The section title would be really long if it included both
those method names, not to mention the other method names defined in that section...
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 #2   Simon Pieters                                   2011-10-13 05:02:04 +0000 
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Why? To make it easier to find (some sections have the relevant API in the ToC,
e.g. designMode). But I guess that applies to any method. Maybe we should have
an index of APIs as an appendix or something.
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 #3   Ian 'Hixie' Hickson                             2011-10-24 18:20:13 +0000 
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An index would make a lot of sense.

An IDL index would be something we can completely automate. The IDL blocks are
computer-readable, and for each IDL field there's a corresponding <dfn>. If someone
can hack together a quick script that just scans all the IDL blocks and extracts out
all the methods and fields and forms an alphabetical index of them, I'd be happy to
add that script to my publishing pipeline.
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 #4   Ian 'Hixie' Hickson                             2011-10-25 05:13:43 +0000 
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(Please reassign to me if you have such a script.)

Check the publishing pipeline and the IDL blocks referenced in the discussion; start by determining how those blocks and their corresponding elements are processed. Done means a script can extract methods and fields and produce an alphabetical API index suitable for the publishing pipeline.