Window Server Event Observer API: Changes

The following header file(s) have changed between 3.1 and 3.2

**Table 1:** aknwseventobserver.h
Type	Class	Change
New public method	`CAknWsEventMonitor`	`IMPORT_C void Enable(TBool aEnable = ETrue);`
New public method	`CAknWsEventMonitor`	`TBool IsEnabled();`