Cheese patches

[Bastien Nocera <hadess hadess net>]

Heya,

A couple of patches for cheese's GTK+ widget, as used in the
gnome-control-center "User Accounts" panel.

The largest patch ("Don't crop the video preview") uses a renamed
MxAspectFrame (currently under review in upstream Clutter), which was
already used within an Intel internal project. It works well in my
testing.

"Make the flash not hide the gnome-shell panel" follows advice by Dan
Winship (IIRC) not put the flash over the shell panel. The majority of
the code is a cut'n'paste of code that's been used in Totem, and
gnome-desktop. Works well in my testing as well.

All patches are here:
https://bugzilla.gnome.org/show_bug.cgi?id=522199