Release 0.99.8.10

  - src/settings.vala: Drop unused safe_get_boolean.
  - Fix deprecated colour overrides.
  - Add logo positioning tweaks.
  - Add prompt box tweaks.
  - src/shutdown-dialog: Fix possible null warning.
  - src/arctica-greeter.vala: Drop unused wm_message_pid.
  - src/main-window.vala: Drop deprecated Gdk.Screen.get_* functions.
  - src/main-window.vala: Fix content_box.margin_right and margin_left.
  - src/main-window.vala: Fix DBusConnection.call.
  - Fix size and position of elements.
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