[libwnck] (21 commits) Non-fast-forward update to branch wip/muktupavels/icons

[Alberts Muktupāvels <muktupavels src gnome org>]

The branch 'wip/muktupavels/icons' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6f26ba3... icon-cache: add invalidation function
  ebe542f... icon-cache: store xwindow in struct
  ca8cac4... icon-cache: store also WnckScreen in struct
  bb8d2c5... icon-cache: remove size parameters from read_icons
  6b0a8cd... icon-cache: add functions to get cached icons
  dc2cfa2... window: remove icons from private struct
  b43b5ff... application: remove icons from private struct
  03181aa... class-group: get icons in getters
  1ca9eeb... icon-cache: turn into a GObject
  5d0c8e0... icon-cache: add invalidated signal
  582e292... icon-cache: read icons in getters
  1812c1c... application: load icons only in getters
  2ca9d52... window: load icons only in getters
  a3febf8... icon-cache: make get_icon_invalidated static
  4197a8d... icon-cache: make read_icons static
  de47388... icon-cache: read only requested size

Commits added to the branch:

  1d37415... doc: remove unused files (*)
  502d10d... screen: move SnDisplay to WnckTasklist (*)
  6bb6cce... handle: remove unused function (*)
  34ced54... tests: add test-icon-cache tool (*)
  8eae770... libwnck/test-icon-cache: Use WnckHandle to get the screen (*)
  0516908... icon-cache: add invalidation function
  1cbd442... icon-cache: store xwindow in struct
  5b0424e... icon-cache: store also WnckScreen in struct
  d724d6a... icon-cache: remove size parameters from read_icons
  552ff23... icon-cache: add functions to get cached icons
  2bc8b09... window: remove icons from private struct
  5cf63b1... application: remove icons from private struct
  db123a8... class-group: get icons in getters
  f9544de... icon-cache: turn into a GObject
  658e8ef... icon-cache: add invalidated signal
  03fdd67... icon-cache: read icons in getters
  c242140... application: load icons only in getters
  6e4f131... window: load icons only in getters
  debbf7c... icon-cache: make get_icon_invalidated static
  0038bd6... icon-cache: make read_icons static
  72bfca4... icon-cache: read only requested size

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