add BorderMutator

common/src/main/java/com/dfsek/terra/api/math/ProbabilityCollection.java

@@ -8,7 +8,7 @@ import java.util.Set;
 
 @SuppressWarnings("unchecked")
 public class ProbabilityCollection<E> {
-    private final Set<Object> cont = new HashSet<>();
+    private final Set<E> cont = new HashSet<>();
     private Object[] array = new Object[0];
     private int size;
 
@@ -45,4 +45,8 @@ public class ProbabilityCollection<E> {
     public int size() {
         return size;
     }
+
+    public Set<E> getContents() {
+        return new HashSet<>(cont);
+    }
 }

common/src/main/java/com/dfsek/terra/api/world/biome/TerraBiome.java

@@ -1,8 +1,11 @@
 package com.dfsek.terra.api.world.biome;
 
 
+import com.dfsek.terra.api.platform.world.Biome;
 import com.dfsek.terra.api.platform.world.World;
 
+import java.util.Set;
+
 /**
  * Interface to be implemented by a custom generator's TerraBiome enum.<br>
  * Represents a custom biome, and contains methods to retrieve information about each type.
@@ -14,7 +17,7 @@ public interface TerraBiome {
      *
      * @return TerraBiome - The Vanilla biome.
      */
-    com.dfsek.terra.api.platform.world.Biome getVanillaBiome();
+    Biome getVanillaBiome();
 
     /**
      * Gets the BiomeTerrain instance used to generate the biome.
@@ -24,4 +27,6 @@ public interface TerraBiome {
     Generator getGenerator(World w);
 
     int getColor();
+
+    Set<String> getTags();
 }