Registers the 'star' feature into the BP Messages component and dynamically loads the bp-messages-star.php file if the feature is active. By default, the feature is active, but can be disabled with the following snippet: 'bp_is_messages_star_active', '__return_false' );
Adds a 'Starred' box to the messages user subnav
Adds an icon to star or unstar a message in a message or message thread loop
Adds the 'Add star' and 'Remove star' options to the message thread 'Bulk Actions' dropdown menu
Adds accompanying CSS and JS to the bp-legacy template pack.