[Development] Make qdoc an officially supported tool for generating QML API documentation

[Sven Anderson]

Hi all,

since qdoc is the only tool that can create documentation for QML APIs, 
but it's (AFAIK) not supported as an external tool - although that is 
very much needed especially for QML - I suggest to make qdoc the offical 
tool for generation of external QML API documentation (and fix it 
accordingly).

I filed a suggestion here: 
https://bugreports.qt-project.org/browse/QTBUG-26096


Best regards,

Sven