Add a list of all the Qt types that are already supported by QML

Add a list of all the Qt types that are already supported by QML, currently there are types such as QRegExp which can be used as a property but are not documented to be available even though they are in fact supported. Whereas some types such as unsigned char will work as a property but not in QML.

Therefore it would be good to have the available types documented so it is clear what support to expect.