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This change modernises GTT by requiring Python 3 only. Portions of this change were made using the 2to3 tool, whereas others are manual ports to ensure use of new Python approaches. Additionally, we fix a startup crash when GNOME Shell isn't running, i.e. GNOME Tweak Tool has been used in a GNOME based environment but not GNOME Shell itself. https://bugzilla.gnome.org/show_bug.cgi?id=781321
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