Refactor ServerUtilsConfig#set to delete existing objects at path

Bukkit/src/main/java/net/frankheijden/serverutils/bukkit/entities/BukkitYamlConfig.java

@@ -54,10 +54,15 @@ public class BukkitYamlConfig implements ServerUtilsConfig {
     }
 
     @Override
-    public void set(String path, Object value) {
+    public void setUnsafe(String path, Object value) {
         config.set(path, value);
     }
 
+    @Override
+    public void remove(String path) {
+        config.set(path, null);
+    }
+
     @Override
     public String getString(String path) {
         return config.getString(path);