[gnome-control-center] (13 commits) ...display: Rewrite as a template widget

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

Summary of changes:

  d9aab36... display: Compare configurations without monitor offset (*)
  4171725... display: Fix leak in night light dialog (*)
  713e209... display: Add missing finalize handler for CcDisplayMonitor (*)
  e520ab8... display: Chain up CcDisplayArrangement finalize handler (*)
  5b53f02... display: Chain up CcDisplayConfig finalize handler (*)
  be3fbd8... display: Redraw arrangement widget after monitor selection  (*)
  4360288... display: Move setter for cloning mode into CcDisplayConfig (*)
  9025f79... display: Add helper that returns the monitor name as new st (*)
  afe8661... display: Allow config to be modified in arrangement widget (*)
  b789a1c... common: Add CcValueObject until HdyValueObject is available (*)
  8503dab... display: Add settings widget for output configuration (*)
  e5925f5... display: Hookup new CcDisplaySettings (*)
  d9a7c84... display: Rewrite as a template widget (*)

(*) This commit already existed in another branch; no separate mail sent