Finished untested biome generator.

Also:
Changed plugin structure to adapt better to server API
Refactored by reorganizing packages.

src/test/java/ca/recrown/islandsurvivalcraft/world/BiomeSelectorTest.java

@@ -1,4 +1,4 @@
-package ca.recrown.islandsurvivalcraft.worldgeneration;
+package ca.recrown.islandsurvivalcraft.world;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
@@ -18,8 +18,7 @@ public class BiomeSelectorTest {
     @BeforeAll
     public void setUp() {
 
-        biomeSelector = new BiomeSelector();
-        biomeSelector.setRandom(new Random());
+        biomeSelector = new BiomeSelector(new Random());
         biomeSelector.initialize();
     }