#854190 by Amitaibu: Provide a nicer experience with stylizer if there are no stylizer-enabled modules running.

Introduce ctools_custom_content module for customizable content panes and move the associated UI code to the module.

Fix some typos; allow plugins to automatically have child plugins, kind of like how content types do only much better.

Moved Panels stylizer UI to CTools. If you use Panels Stylizer, be sure to update Panels at the same time.

#849418: "Custom" content type was accidentally losing context substitutions created when reusable custom content types went in.

Allow Views to use their exposed filters as pane configuration. This is under the "Allow" settings in the Content pane display.

#847682 by dagmar: Allow export.inc controlled objects to have data that exists in sibling tables to enable integration with exportables.module.

#836828 by jmiccolis: ctools_include() would try to include again even though it was trying to statically cache a list of files already included.

#842882 by Amitaibu: Safer handling of determing if an object is new or updated when using ctools_export_crud_save().

#635730 by dereine and merlinofchaos: Fix page title pane to show actual title. Allow the tag and tag class and id to be specified in pane settings.

#815164 by DeFR: Replace fragile server side cache of aggregated .js and .css with more robust embedded .js communicating this information.