Add a link to Siemens Corporate Technology

... in the copyright footer.

Signed-off-by: Wolfgang Mauerer <wolfgang.mauerer@siemens.com>
Mention the Siemens-internal sponsor

Codeface development is possible thanks to funding
by the Open Source Group at Siemens. This should
be visible in public. Thanks!

Signed-off-by: Wolfgang Mauerer <wolfgang.mauerer@siemens.com>