Function: Checks if a theme has been changed and runs ‘after_switch_theme’ hook on the next WP load.

Function: Includes and instantiates the WP_Customize_Manager class.

Function: Publishes a snapshot’s changes.

Function: Filters changeset post data upon insert to ensure post_name is intact.

Function: Adds settings for the customize-loader script.

Function: Returns a URL to load the Customizer.

Function: Registers the internal custom header and background routines.

Function: Adds CSS to hide header text for custom logo, based on Customizer setting.

Function: Gets the theme support arguments passed when registering that support.

Function: Allows a theme to de-register its support of a certain feature