Add config for blocking copies of levels

[Arcadius2006]

There should be an option to block publishing a level if another level that's exactly the same is published on the server

[Leafar70]

I completely agree

[turecross321]

idk man this would pretty easily be bypassed even if it was added

[TorutheRedFox]

yeah, just change one tiny little thing and the hash will be different

[Arcadius2006]

still a good thing to have regardless

[Oo1Toyo1oO]

This is actually an amazing idea.