SimpleSorter

Merge pull request #4 from mjb2k/autosort

errouneously made the listener public

make sure we check that the sorter still exists. If the sorter is deleted we stop autosorting.

Everything seems to be in order, autostart can turn on and off and also they are stopped if the player leaves, going to make a PR on the original repo but I will be using this as is for my farms

made autosort command, need to test