Doc: Cleaning up QHP information in module configuration files.

Doc: Cleaning up QHP information in module configuration files.

There is a common standard among all Qt modules. These changes affect
the final .qch file for each module.

Changes:
1)URL in qt-project.org is confirmed by DevNet maintainer
url = http://qt-project.org/doc/<module>

2)Landing page title mapping
indexTitle = landing page

3)"C++ Classes" as a child node.
The list of C++ classes and the titles are specified in the wiki.

4)Removed extra subprojects.
They are not needed for now. Each module may need additional nodes.

Change-Id: I1825476c21fe9aaddc9d6b512ff74229f17271a0
Reviewed-by: Martin Smith <martin.smith@digia.com>