Add a few admin filters / actions (code included)

In flamingo/admin/includes/class-contacts-list-table.php, I request the following code be added to the functions.

Line 8, in ‘Flamingo_Contacts_List_Table’:

public static function define_columns() {
		$columns = array(
			'cb' => '<input type="checkbox" />',
			'email' => __( 'Email', 'flamingo' ),
			'full_name' => __( 'Name', 'flamingo' ),
			'tags' => __( 'Tags', 'flamingo' ),
			'history' => __( 'History', 'flamingo' ),
			'last_contacted' => __( 'Last Contact', 'flamingo' ) );
                // NOTE: New filter here
		$columns = apply_filters("manage_edit-".Flamingo_Contact::post_type."_columns", $columns);

		return $columns;
	}

Line 122-124, in ‘Flamingo_Contacts_List_Table’:

function column_default( $item, $column_name ) {
                // NOTE: Calls action to retrieve additional custom field values
		return do_action("manage_".Flamingo_Contact::post_type."_posts_custom_column", $column_name, $item->id);
    }

I request this because I need to update an existing system to allow for more fields in the Address Book and these hooks I’ve provided follow WordPress standards.

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