Use data-handler hooks intead of front-end only hooks

[Sama34]

The plugin currently uses front-end hooks, but it is possible threads or post get inserted or updated out of the scope of the front-end, so ideally data-handler hooks should be used.

I suppose the same could be true about other non-post hooks. For easy of communication I share next a comparison of best practice hooks compared to the current ones being used :

• newthread_do_newthread_end => datahandler_post_insert_thread_end
• xmlhttp_update_post => datahandler_post_update_end
• editpost_do_editpost_end => datahandler_post_update_end
• newreply_do_newreply_end => datahandler_post_insert_post_end
• member_do_register_end => datahandler_user_insert_end

I didn't check how this plugin handles content deletion so I won't suggest that here. Also, this might not be urgent so probably an improvement for later versions.