Parse the requested family before we're looking/saving into the cache,
thus hitting the cached EngineData for:
* quoted family names (eg. QFont("'Arial'"))
* non-simplified family names (eg. QFont(" Arial "))
* substituted family names (\sa QFont::insertSubstitution())
* explicit fallback list, where possible (eg. QFont("Tahoma, Arial"))
This also improves the cache hitting for the font engines in some cases.
Change-Id: I18cdc3e8d669cccec961f84e9b27329402e2b7ed
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>