[EXPLORER][SHELL32][SDK] Show/hide 'Run' menu item (#6592)

Improve Start Menu customization.
JIRA issue: CORE-16956
- Add SHSettingsChanged prototype to
  <undocshell.h>.
- Add SetRestriction helper function.
- Implement showing/hiding Run menu
  item of Start Menu.

sdk/include/reactos/undocshell.h

@@ -49,14 +49,12 @@ typedef struct _TRAYNOTIFYDATAW
 
 #endif /* defined (_SHELLAPI_H) || defined (_INC_SHELLAPI) */
 
-
 /****************************************************************************
  * Taskbar WM_COMMAND identifiers
  */
 #define TWM_DOEXITWINDOWS (WM_USER + 342)
 #define TWM_CYCLEFOCUS (WM_USER + 348)
 
-
 /****************************************************************************
  *  IDList Functions
  */
@@ -96,7 +94,6 @@ HRESULT WINAPI SHILCreateFromPathW (
 BOOL WINAPI StrRetToStrNA(LPSTR,DWORD,LPSTRRET,const ITEMIDLIST*);
 BOOL WINAPI StrRetToStrNW(LPWSTR,DWORD,LPSTRRET,const ITEMIDLIST*);
 
-
 /****************************************************************************
  * SHChangeNotifyRegister API
  */
@@ -258,6 +255,7 @@ ExtractIconResInfoW(
 /****************************************************************************
  * File Menu Routines
  */
+
 /* FileMenu_Create nSelHeight constants */
 #define FM_DEFAULT_SELHEIGHT  -1
 #define FM_FULL_SELHEIGHT     0
@@ -732,6 +730,8 @@ Activate_RunDLL(
     _In_ LPCWSTR cmdline,
     _In_ INT cmdshow);
 
+BOOL WINAPI SHSettingsChanged(LPCVOID unused, LPCWSTR pszKey);
+
 /*****************************************************************************
  * Shell32 resources
  */