Fix Frost Barrier not activating

Negative yaw values are considered valid in minecraft.
UtilShapes doesn't correctly handle negative yaw values
(throws an ArrayIndexOutOfBoundsException) so whenever
a player is facing east they're unable to activate Frost
Barrier.

This commit fixes the issue by allowing UtilShapes to take
negative values.

Plugins/Mineplex.Core.Common/src/mineplex/core/common/util/UtilShapes.java

@@ -97,6 +97,10 @@ public class UtilShapes
 
 	public static BlockFace getFacing(float yaw)
 	{
+		while (yaw < 0)
+		{
+			yaw += 360;
+		}
 		return radial[Math.round(yaw / 45f) % 8];
 	}