Nyall Dawson e5c709ccd6 [api] Provide a mechanism to specify a list of fallback font families for
QgsTextFormat

Just like in CSS, these families will be used as an ordered list
of fonts to fallback on if the actual text format font isn't available
on a particular QGIS install.

This is API only, and isn't designed to be shown anywhere in QGIS.
Instead the intended use is for creators of QGIS styles to either use
the raw api to specify the list of fallback fonts OR hand edit the
style xml to add the fallback fonts, e.g by adding a block like:

    <families>
      <family name="Arial"/>
      <family name="Helvetica"/>
      <family name="Sans"/>
    </families>

To the "text-style" parent element.
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