[gnome-control-center] (15 commits) ...panel-list: Instrument more functions

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

Summary of changes:

  93209fa... panel: Remove useless get_type() function (*)
  7e28651... panel: Remove unused macro (*)
  62743ab... window: Factor out function to find panel iter (*)
  3e9425a... panel: Remove size negotiation machinery overrides (*)
  75167f4... panel: Add get_sidebar_widget() vfunc (*)
  6541c12... trivial: Update code style (*)
  b02bc2a... panel-list: Replace set_view() by go_previous() (*)
  de15083... panel-list: Rename internal function (*)
  6295831... window: Add panel's sidebar widget to sidebar (*)
  2c18053... window: Set the panel name as title for the widget (*)
  8c144b6... window: Instrument some functions (*)
  8d2265c... window: Properly update headebar buttons and title (*)
  fdf22ad... tests: Properly generate desktop files (*)
  896ff73... tests: Add test panels for sidebar widget (*)
  aeb060c... panel-list: Instrument more functions (*)

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