[OSK] Implement "Use Click Sound" feature

- Implement the save/load handler for this feature
- Check the "Use Click Sound" item state accordingly depending if it's enabled or disabled
- Use PlaySoundW() to play the wave sound file from resource
- Add the WAV sound click file. The work is made thanks to Midori Mizuno

base/applications/osk/main.h

@@ -25,6 +25,7 @@ typedef struct
     HWND       hActiveWnd;
     BOOL       bShowWarning;
     BOOL       bIsEnhancedKeyboard;
+    BOOL       bSoundClick;
 } OSK_GLOBALS;
 
 /* DEFINES ********************************************************************/