Fixes some things regarding vehicle teleportation

Adds extra space between the portal and the vehicle if the destination portal is always on
Fixes a bug causing vehicles not being detected soon enough
Fixes boats facing into the portal rather than out from the portal
Fixes boats spawning inside water rather than on top of it if water is in front of a portal

src/main/java/net/knarcraft/stargate/utility/DirectionHelper.java

@@ -7,7 +7,11 @@ import org.bukkit.Location;
 /**
  * This class helps with direction-dependent (modX, modZ) calculations
  */
-public class DirectionHelper {
+public final class DirectionHelper {
+
+    private DirectionHelper() {
+
+    }
 
     /**
      * Gets the block at a relative block vector location