Title abstraction

[bertuss]

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[arthurattwell]

Thanks, @bertuss.

As I read this (may be missing something) there is no html-title set for PDF outputs with multiple files (print-pdf-file-list.size > 1).

So I don't think we can do without setting these defaults first:

{% capture html-title %}{{ project-name }}{% endcapture %}
{% if title and title != "" %}
    {% capture html-title %}{{ title }}{% endcapture %}
{% endif %}

In the original, we only override html-title for PDF outputs if *-pdf-file-list.size > 1. So I think we should still do that last.