[gnome-boxes] (12 commits) Non-fast-forward update to branch wip/props-ui-files

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

The branch 'wip/props-ui-files' 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:

  2f58fa5... Add DeferredChange class
  78b70a9... props-page-widget: Add add_deferred_change()
  4286e30... props-page-widget: Add boolean reboot_required field
  896b42c... props-page-widget: Add add_property()
  31fe2fe... props-page-widget: Add add_size_property()
  9265ab4... props-page-widget: Add add_string_property()
  9151642... properties: Asynchronously populate pages
  d5a5072... props-page-widget: Async constructor
  9ede2d6... i-props-provider: get_properties() now async
  4450096... tmp

Commits added to the branch:

  b9c4cca... spice-display: Fix check for SPICE agent availability (*)
  1b8a322... Add DeferredChange class
  33d5140... props-page-widget: Add add_deferred_change()
  aa0f5f4... props-page-widget: Add boolean reboot_required field
  0f8bcdb... props-page-widget: Add add_property()
  cd6d179... props-page-widget: Add add_size_property()
  8cd92c3... props-page-widget: Add add_string_property()
  c14a0cc... properties: Asynchronously populate pages
  12fcbab... props-page-widget: Async constructor
  5f689f5... i-props-provider: get_properties() now async
  94480c6... Add PropertiesSnapshots widget
  311602d... tmp

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