Renames activatedTime to triggeredTime and makes some public fields private

Makes the active portals queue and open portals queue and languageLoader fields private
Cleans the StargateThread a bit
Renames activatedTime to triggeredTime as the dual use (open and activate) made the name confusing

src/main/java/net/knarcraft/stargate/thread/BlockChangeThread.java

@@ -30,7 +30,7 @@ public class BlockChangeThread implements Runnable {
      */
     public static void pollQueue() {
         //Abort if there's no work to be done
-        BlockChangeRequest blockChangeRequest = Stargate.blockChangeRequestQueue.poll();
+        BlockChangeRequest blockChangeRequest = Stargate.getBlockChangeRequestQueue().poll();
         if (blockChangeRequest == null) {
             return;
         }