main: Make sure that --mode parameter is valid
Instead of falling back to a set of default values or crashing the window manager when an invalid mode is specified, check the value of the ShellGlobal:session-mode property before taking over as WM and make a clean exit if it cannot be resolved to an existent mode. https://bugzilla.gnome.org/show_bug.cgi?id=676156
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3d262241
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