- Fully qualify names in \qml* commands
- Remove unnecessary 'void' return types in \qmlmethod commands
- Remove unnecessary module and type qualifiers from links
- Document Canvas::onImageLoaded()

Change-Id: I32d1a7a54c407ae98b60857780f5536c6d52fca2
Reviewed-by: Yunqiao Yin <charles.yin@nokia.com>