Prune old PMs + optimize DB v1.0

Description
Simple plugin which automatically checks for old read/unread PMs and deletes them automatically + optimizes PM tables in MyBB after cleaning automatically.
I created this plugin, because PMs can increase the size of database dramatically.
DELETE read PMs after 30 days
DELETE unread PMs after 90 days
-> you can set your own values in prunepms.php file located in /tasks folder
This plugin affects messages in INBOX + SENT BOX + TRASH BIN

Thanks to @Jones H and @Euan T and @Supryk

Installation
Just upload all files into your forum and activate it in the ACP.