Several bugfixes

This stops the error showing in logs about closing invalid handle (for unmuteprisoners), makes it so LRs get properly cleaned up if they are still active when roundtime runs out (had some problems with this bug in combination with circle of doom last request on my server :p) and makes sure that LRs with delayed starting can no longer start when the other participant already got LR'ed in the meantime etc. I have a few more things ready but will test those first.