Added new option "Enable accelerators"

It will control whether keyboard accelerators are used in start menu.

Disabling it can be helpful for people that tend to hit some accelerator by mistake.

Fixes #447

Src/StartMenu/StartMenuDLL/StartMenuDLL.rc

@@ -637,6 +637,8 @@ BEGIN
     IDS_MENU_USERNAME       "User name text"
     IDS_MENU_USERNAME_TIP   "Enter the text you want to see in the user-name portion of the menu (for skins that show the user name)"
     IDS_PIC_COMMAND         "User picture command"
+    IDS_ENABLE_ACCELERATORS "Enable accelerators"
+    IDS_ENABLE_ACCELERATORS_TIP "Use keyboard accelerators to execute menu commands"
 END
 
 STRINGTABLE