Added archive with option to search by user and keywords. You can set how many messages to show per page in admin options. This feature requires the "View archive" user group permission.
Added new admin option called "Shoutbox refresh timeout" that allows you to stop refresh interval if the user is not active in the Shoutbox for more than x minutes. This feature existed before but it was set to 10 minutes and could not be changed.
Added auto-scroll toggle to allow reading older messages without being forced back. This activates/deactivates when you scroll.
Loading older messages is now smother.
Made images smaller with CSS to take less space.