Display fully qualified class/namespace name as page header
It's the most important information to see quickly what the page is about.
Using the fully qualified name contains the knowledge which namespace contains a
class/another namespace required which is helpful if one wants to use it in their
Class inside namespace:
Class inside nested namespace:
Subscribers: ngraham, aacid, jucato, kde-frameworks-devel, kde-doc-english
Differential Revision: https://phabricator.kde.org/D26197