[amarok] /: distinguish between mp4, m4a, m4v types in Amarok::FileType

[Bart Cerneels]

On Wed, Apr 11, 2012 at 11:10, Matěj Laitl <matej at laitl.cz> wrote:
> I'm running this through review board as there seems no general
> agreement on Meta::Track:type() semantics. (Speaking of which, I'd be
> most satisfied if it returned (the most specific) mime-type represented
> using dedicated class that would support mimetype hierarchy)

Yeah, we need to detail this. I think originally type() was meant for
display purposes only. We should add mimetype().