Revert "Added a Downloader for downloading external JARs."

1. No diff visibility.
2. Missing // Surge comments at least for the imports.
3. Untested code that crashes the server.
Change HashSets to arrays as suggested by Icyene.
Clean up c3eb46596a8afabcdb0b48808b9a7b7f46359528
Fixed AreaSelections to correctly check for overlap/containment.
*The overlaps() and contains() methods have been fixed.
Merge remote-tracking branch 'origin/master' into KeirJames
Added getCurrentTPS() method and made the tps command to reflect the changes