[Suggestion] Implement playerbot diff

[brian8544]

This isn't the right place to make such request, but I feel like this would be a great optimization, which allows to run more bots.

Add a diff with/without player in server. The server will tune bot activity to reach the desired server tick speed (in ms), as what MaNGOS is using

celguar/mangosbot-bots@ce4bd79

[liyunfan1223]

That's a good idea, prepare to look into it.