let's go with what nemo suggests

Fix hedgehogs number desync. Now all desyncs except the one from issue #521 should be fixed. Please, test.

Check for admin role right in the sql statemenet

let's try to kill the thread right away and protect the thread variable with a mutex

added two security flags to windows linking

I see no reason why a visual effect needs Distance. IMO square should look just fine. Untested. Oh. Also reduced flake count at Randi's request.