feat: add time zone configuration applet to System Configuration

scripts/copy_icons.sh

@@ -52,6 +52,7 @@ ICONS=(
     "apps/scalable/system-file-manager.svg"
     "apps/scalable/preferences-desktop-apps.svg"
     "categories/scalable/preferences-system.svg"
+    "categories/scalable/preferences-system-time.svg"
     "apps/scalable/accessories-calculator.svg"
     "apps/scalable/web-browser.svg"
     "places/scalable/folder.svg"

scripts/install_apps.sh

@@ -35,6 +35,7 @@ APPS=(
     "procmgr|apps/scalable/system-monitor.svg"
     "calculator|apps/scalable/accessories-calculator.svg"
     "printers|devices/scalable/preferences-devices-printer.svg"
+    "timezone|categories/scalable/preferences-system-time.svg"
     "rpgdemo|apps/scalable/utilities-terminal.svg"
     "paint|apps/scalable/kolourpaint.svg"
     "screenshot|apps/scalable/gnome-screenshot.svg"