[gtk] (16 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:

  fa7a597... column view: Add some helpers
  a68f59d... Add GtkColumnViewSorter
  1ed430a... column view: Add a sorter property
  e7843c0... column view column: Add a sorter property
  0993bcb... column view title: Show sort indicators
  755ab64... column view: Add a sort-by api
  54b57ab... inspector: Use a column view for properties
  033ab6d... inspector: Use a column view for the resource list
  28f6776... Add GtkTreeListRowSorter
  69fea58... inspector: Make the resource list sortable
  2708b87... inspector: Use a column view for actions
  c53326e... inspector: Touch up list styling
  1dc3b74... Add GtkDropDown
  8668be7... builder-tool: Pass through CDATA where it makes sense

Commits added to the branch:

  d01587b... builder-tool: Pass through CDATA where it makes sense
  0763465... column view: Add some helpers
  0e53508... Add GtkColumnViewSorter
  25f56e4... column view: Add a sorter property
  a101d12... column view column: Add a sorter property
  fcf6b64... column view title: Show sort indicators
  fa357b8... column view: Add a sort-by api
  3fc8b17... inspector: Use a column view for properties
  fd9768c... inspector: Use a column view for the resource list
  6df6a83... Add GtkTreeListRowSorter
  317bd3e... inspector: Make the resource list sortable
  84cb8b9... inspector: Use a column view for actions
  43a50d2... inspector: Touch up list styling
  3f87198... Add GtkDropDown
  cd7f67b... dropdown: Add a convenience constructor
  54f3609... inspector: Use dropdowns in property editor