[libwnck] (5 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:

  023e3c5... class-group: get icons in getters
  e3e3cd0... application: remove unused struct member
  aa6719b... application: get icons in getters
  c84fadf... window: get icons in getters

Commits added to the branch:

  f18156c... application: remove unused struct member
  e82880d... icon-cache: cache only one size
  6a13def... class-group: get icons in getters
  cb7b54b... application: get icons in getters
  4b940d0... window: get icons in getters