Add a minimize button on Elisa

Add a minimize button in :
The main nenu
The lists / coverflow and grid view
The player

The minimize button must have two different modes:

1. The default one :
-add a minimize, unfullscreen and close button. these button must be visible only when the mouse is moving.

2. "the device integration mode"
Put a home button only, in each screen. This button will be visible all the time. The action will be customized for customer integration.

see the screenshot in the specification page.