Method: Builds and returns the Customizer CSS template contents.
Filter Hook: Whether customizer styles should print for shortcodes or not.
Method: Print the CSS for the customizer for shortcodes.
Method: Loads the Basic Settings for the Class to work
Filter Hook: Allow plugins to add themselves to this list.
Method: Build the Setting name using the HTML format for Arrays
Method: Adds a setting field name to the Array of Possible Selective refresh fields
Method: Using the Previously created CSS element, we not just re-create it every setting change
Method: Use a “alias” method to register sections to allow users to filter args and the ID
Filter Hook: Filter the Section ID