[interfacekit] private window_look, window_feel entries

Hi all,

Stefano and I were talking about adding private entries for window_look and
window_feel enum.
In fact, we found some not documented ones in several places :

* 25 => Canna method addon and Bottomline Window in input_server
* kWindowScreen = 1026 in OpenTracker
* kPrivateDesktopWindowLook = 4 in OpenTracker
* kPrivateDesktopWindowFeel = window_feel(1024) in OpenTracker
* kMenuWindow= 1025 in Menu classes

The idea would be to add them somewhere in a private header, possibly
interface/WindowPrivate.h

Definitions would be as written in OpenTracker :
const window_look kPrivateDesktopWindowLook = window_look(4);
const window_feel kPrivateDesktopWindowFeel = window_feel(1024);

Thoughts ?
Bye,
Jérôme

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