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.

#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.

#467898 by mikeker: Allow taxonomy term argument to be restricted to a particular set of vocabularies.

#827370 by dereine: Allow the new auto-submit.js to allow a single class that causes every element in the form to auto-submit.

Issue #817612 by elstudio: Fix validation error that was making it impossible to add 'Existing node' content_types.

actually do what it advertises and output last change time.

terms from a node context.

content_type plugin.