Move settings to dconf

Hi, as you can see in src/PantheonGreeter.vala in the following code lines, we use static variables for theming and such stuff. Can we use variables stored in dconf or in a text config file?

    var settings = Gtk.Settings.get_default ();
    settings.gtk_theme_name = "elementary";
    settings.gtk_icon_theme_name = "elementary";
    settings.gtk_font_name = "Droid Sans";
    settings.gtk_xft_dpi= (int) (1024 * 96);
    settings.gtk_xft_antialias = 1;
    settings.gtk_xft_hintstyle = "hintslight";
    settings.gtk_xft_rgba = "rgb";
    settings.gtk_cursor_blink = true;

teemperor: Hijacking this bug: We should move all settings to dconf/textfile whatever. Also stuff like the wallpaper scaling etc.