iOS: Make default system font Helvetica

Without a platform theme implementatin we were relying on
QCoreTextFontDatabase::defaultFont() to return the system font.

This didn't work because it reported the system font that iOS reports,
'.Helvetica Neue UI', which is a private font that does not get added
to our font database. The result was that we picked the first font in
the list of known fonts -- in this case 'Academy Engraved LET'.

We now implement QIOSTheme::font(), which takes precedence over the
font database's default font, and hard-code the system font to
'Helvetica', since Qt does not yet have the concept of private
system fonts.

Change-Id: I901cf9c2b662ea2795212376b84b8391be2efbbe
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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