[explorer_new]

[explorer_new]
- Implement showing and closing the start menu by pressing the WIN key
- Implement handling WM_KLUDGEMINRECT message that informs the window manager the place of an application in the taskbar in order to show the minimization or maximization animation of a window
- Implement showing taskbar settings when the user selects to show the taskbar settings from the settings menu in start menu
- Implement hiding the Favorites menu in the start menu when needed

svn path=/branches/shell-experiments/; revision=62010