Clean up in preparation for persistence system.

src/main/java/ca/recrown/islandsurvivalcraft/persistence/Settings.java

@@ -0,0 +1,5 @@
+package ca.recrown.islandsurvivalcraft.persistence;
+
+public enum Settings {
+    
+}

src/main/java/ca/recrown/islandsurvivalcraft/preferences/GeneralConfiguration.java

@@ -1,13 +0,0 @@
-package ca.recrown.islandsurvivalcraft.preferences;
-
-import java.io.Serializable;
-
-public class GeneralConfiguration implements Serializable {
-
-    /**
-     *
-     */
-    private static final long serialVersionUID = 5820622075140630470L;
-    
-    
-}