Implement Tray context menu "Undo Tile" (resp. "Undo Cascade")

• Tray context menu has an "undo" action that "cancels" Tile/Cascade previous commands, if any
• It shall only be enabled (WinXPSP3 : visible) if there is an open window and that Tile/Cascade commands were previosuly used
• Text shall be adapted to the command (Undo Tile or Undo Cascade)
• It shall effectively revert to previous display configuration

Current implementation is a permenant "Undo" menu item, enabled without action (empty stub)

Full design implementation with a validated proposal is available in abandonned PR  : https://github.com/reactos/reactos/pull/4646 and in attached patch