Partially close #43 (add SSAO)

I am surprised how much this small change improves how things look. I may still implement SSAO in the future but for the time being this is a big improvement for how things look.

src/main/java/com/seibel/lod/enums/ShadingMode.java

@@ -0,0 +1,18 @@
+package com.seibel.lod.enums;
+
+/**
+ * NONE, DARKEN_SIDES
+ * 
+ * @author James Seibel
+ * @version 7-25-2020
+ */
+public enum ShadingMode
+{
+	/** LODs will have the same lighting on every side.
+	Fastest, but can make large similarly colored areas hard to differentiate */
+	NONE,
+	
+	/** LODs will have darker sides and bottoms to simulate top down lighting.
+	Fastest */
+	DARKEN_SIDES;
+}