At this point the textures_bundle is still required, but only because
of the icons of the textures. Also, some changes should be done for the
visuals of the downloading.
Also, did a fix in FileDownloader: In case the URL given does not look
to be an image file, we should cancel the download instead of treating
it as a zip archive--it can be that eg we were redirected to a sign-in
page and we don't want to download the content of the page and save it
as a zip file.
Task-number: QDS-8664
Change-Id: Iec40e540c116030288df76e1922eab56ba323d1e
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
