[heycam/webidl] Update method creation for operations (#155)

This consolidates the spec text for creating the functions for interface operations and namespace operations, using the more modern style seen in namespace operations (introduced in df8c9c4ef7e32298ea3b8b13eed73790957468da) as the base.

Along the way, this fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=18547 (making all methods [ImplicitThis], and getting rid of [ImplicitThis]), and fixes https://github.com/whatwg/html/issues/643 (a related issue on the HTML side).

This also fixes #106, since we now explicitly use the CreateBuiltinFunction abstract operation.

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@bzbarsky please take a look! I'm rather pleased that this managed to fix the long-standing [ImplicitThis] issue.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/155

-- Commit Summary --

  * Update method creation for operations

-- File Changes --

    M index.html (280)
    M index.xml (263)

-- Patch Links --

https://github.com/heycam/webidl/pull/155.patch
https://github.com/heycam/webidl/pull/155.diff

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