[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:

  e82880d... icon-cache: cache only one size
  6a13def... class-group: get icons in getters
  cb7b54b... application: get icons in getters
  8b8aad7... window: get icons in getters

Commits added to the branch:

  a886961... screen: store WnckHandle in struct
  5dfab42... icon-cache: cache only one size
  94906e6... class-group: get icons in getters
  d00b32c... application: get icons in getters
  18a4ad4... window: get icons in getters