[MPEG-OTSPEC] Updates to Adobe proposals

[Skef Iterum]

I have updated Adobe's current proposals in the following way:

 1. varchintguide.pdf has proper cross-references and looks more
    generally like a standard ISO proposal. Liam also took a look at the
    draft and provided valuable feedback.

    https://github.com/adobe-type-tools/opentype-spec-drafts/blob/main/varchintguide.pdf
 2. newfeatvar_spec.pdf has been substantially rewritten to a) be more
    generally like a standard ISO spec, b) incorporate the material in
    negation.pdf, and c) reorder and rework the material on conditions,
    condition sets, and the Feature Variations mechanism. The latter was
    partly because I found it was clearer to discuss conditions before
    variations but also to prepare for the addition of conditional
    variable composites (which I understand Behdad is working on).

    Added or changed text is highlighted, other text exists in the
    current specification, although not always in the same place.

    https://github.com/adobe-type-tools/opentype-spec-drafts/blob/main/newfeatvar_spec.pdf
 3. negation.pdf is now retired (having been incorporated into
    newfeatvar_spec.pdf).
 4. As we have discussed Peter is going to work the equivalent of the
    content of cff2hintorder.pdf into his updates, so that is also
    retired. I'm working on the requested test font.

Thanks,
Skef
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