Restore lockdown integration.
With lockdown settings available through GSettings, widgets can handle lockdown integration themselves without having to use EShellSettings. Also fixed a few places where printing or save-to-disk actions were either not properly wired up or not responding to lockdown settings, but much more work needs done. Attachments, for example, are not honoring the disable-save-to-disk setting at all. This too requires the recently-added gsettings-desktop-schemas dependency.
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