Handle reborns(rebirths) - set/get from db, flag to enable/disable and 1 basic NPC to handle it (#413)

* Added ability to handle reborn, option to enable/disable in ServerConstant

* Basic rebirth NPC for wolf spirit Ryko chan - id 9010021

* Added player message when rebirth system is off

* Removed some forgotten comments

* Ryko now displays original message if rebirth is not enabled

src/tools/exceptions/NotEnabledException.java

@@ -0,0 +1,12 @@
+package tools.exceptions;
+
+public class NotEnabledException extends RuntimeException {
+
+    public NotEnabledException() {
+        super("Feature not enabled, please enable the feature in ServerConstant");
+    }
+
+    public NotEnabledException(String message) {
+        super(message);
+    }
+}