[gnome-control-center] (17 commits) ...window: reimplement search

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

Summary of changes:

  71d39a4... window: turn into a final class (*)
  fe3a237... build: copy CcWindow in alt/ directory (*)
  2bb6d44... build: create another executable for the new layout (*)
  c006198... window: add a horizontal box before the stack (*)
  c47bc08... window: separate the panel selector (*)
  2f844e2... window: make the panels' stack expand (*)
  77ef6c4... window: remove the fixed width request code (*)
  6f38ca8... window: remove the small screen code (*)
  55cc4c3... window: make it a template class (*)
  df086d4... window: put the search button in the start of the headerbar (*)
  fa1a6b3... window: pack the headerbar inside a box (*)
  c0bdc06... window: introduce the second headerbar (*)
  a267ebd... window: make the sidelist and first headerbar horizontally  (*)
  2590e38... window: set the default width and height (*)
  9d06a0f... window: add a placeholder view (*)
  b6ab2a4... window: use a listbox (*)
  57ba49a... window: reimplement search (*)

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