Navigation Pane API: Changes

The following header file(s) have changed between 3.0 and 3.1

**Table 3:** aknnavi.h
Type	Class	Change
New public method	`CAknNavigationControlContainer`	`CAknNavigationDecorator* Top(TBool aIgnoreFepEditorIndicator) const;`
New public method	`CAknNavigationControlContainer`	`void SetPreferredNaviDecoratorLayoutStyle(TInt aLayoutStyle);`

**Table 4:** aknnavide.h
Type	Class	Change
New public method	`CAknNavigationDecorator`	`virtual void HandleResourceChange(TInt aType);`

**Table 5:** aknnaviobserver.h
Type	Class	Change
New enum value	`MAknNavigationObserver`	`TAknNavigationEvent::ENaviEventAlreadyLeftmostItem`
New enum value	`MAknNavigationObserver`	`TAknNavigationEvent::ENaviEventAlreadyRightmostItem`