Qt copyrights are now in The Qt Company, so we could update the source
code headers accordingly. In the same go we should also fix the links to
point to qt.io.

Change-Id: I8467410bfad44e8d3fe6bd5724c61bb0c07c91f9
Reviewed-by: Kurt Pattyn <pattyn.kurt@gmail.com>
Reviewed-by: Sergio Ahumada <sahumada@texla.cl>