Add sapling configs to biome and dimension files

src/main/java/com/volmit/iris/engine/object/IrisBiome.java

@@ -81,6 +81,12 @@ public class IrisBiome extends IrisRegistrant implements IRare {
     @ArrayType(min = 1, type = IrisEntityInitialSpawn.class)
     private KList<IrisEntityInitialSpawn> entityInitialSpawns = new KList<>();
 
+    @Desc("Sapling override settings")
+    private IrisSaplings saplings = new IrisSaplings();
+
+    @Desc("Enable sapling overrides")
+    private boolean useSaplings = false;
+
     @ArrayType(min = 1, type = IrisEffect.class)
     @Desc("Effects are ambient effects such as potion effects, random sounds, or even particles around each player. All of these effects are played via packets so two players won't see/hear each others effects.\nDue to performance reasons, effects will play arround the player even if where the effect was played is no longer in the biome the player is in.")
     private KList<IrisEffect> effects = new KList<>();

src/main/java/com/volmit/iris/engine/object/IrisDimension.java

@@ -74,6 +74,12 @@ public class IrisDimension extends IrisRegistrant {
     @Desc("Improves the biome grid variation by shuffling the cell grid more depending on the seed. This makes biomes across multiple seeds look far different than before.")
     private boolean aggressiveBiomeReshuffle = false;
 
+    @Desc("Sapling override settings")
+    private IrisSaplings saplings = new IrisSaplings();
+
+    @Desc("Enable sapling overrides")
+    private boolean useSaplings = false;
+
 
     @Desc("Instead of a flat bottom, applies a clamp (using this noise style) to the bottom instead of a flat bottom. Useful for carving out center-dimensions in a dimension composite world.")
     private IrisShapedGeneratorStyle undercarriage = null;