[gtk] (8 commits) Non-fast-forward update to branch prop-list

[Matthias Clasen <matthiasc src gnome org>]

The branch 'prop-list' 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:

  9bcbd4a... Redo sort list model with GtkSorter
  5d66380... column view: Add some helpers
  a2405b0... Add GtkColumnViewSorter
  db49971... column view: add sort model and sorter properties
  695353b... column view column: Add a sorter property
  102c7d1... column view title: Show sort indicators
  eda0913... column view: Add a sort-by api
  118789d... inspector: Use a column view for the property list

Commits added to the branch:

  a6f581c... Redo sort list model with GtkSorter
  aca820c... column view: Add some helpers
  057b0d6... Add GtkColumnViewSorter
  581a196... column view: add sort model and sorter properties
  6c501f2... column view column: Add a sorter property
  6c2a1a3... column view title: Show sort indicators
  46cb813... column view: Add a sort-by api
  4afd936... inspector: Use a column view for the property list