[Qt-qml] Changes to focus properties

[michael.brasser at nokia.com]

Hi,

I have some small changes to the focus-related properties that I'm hoping to commit in the next couple days:

* 'wantsFocus' will be renamed to 'activeFocus'
* the semantics of reading from 'focus' will change to indicate whether the item is the focus item for its FocusScope

This fixes two confusions with the current properties: (1) the 'wantsFocus' name doesn't really match what that property does, and (2) the semantics of reading from vs. writing to 'focus' are currently very different. 

For more on the change see the attached path; I'm happy to give more details on the reasoning if anyone is interested.

Regards,
Michael

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