Make it possible to know when a screen is being removed

So far, we had to listen to the QObject::destroyed signal from the QScreen
class to figure out whether a screen was removed. Often, this is already
too late, given that most of the QWindows have been moved by then and we
don't get to react before the windows are being set to the primary screen.

This patch introduces a new signal that will notify about a screen removal
before the screen is started to be destroyed, so that the application gets
to decide what to do with the screens before Qt decides to move things around.

[ChangeLog][QtGui][QGuiApplication] Added QGuiApplication::screenRemoved
signal to inform that a screen has been removed, before Qt reacts to it.

Change-Id: I99304179f4d345cae581a87baac6cff7b8773dea
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>