Implement title/signature switching

src/main/java/emu/nebula/server/handlers/HandlerPlayerSignatureEdit.java

@@ -0,0 +1,22 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.PlayerSignatureEdit.PlayerSignatureEditReq;
+import emu.nebula.net.HandlerId;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.player_signature_edit_req)
+public class HandlerPlayerSignatureEdit extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Parse request
+        var req = PlayerSignatureEditReq.parseFrom(message);
+        
+        session.getPlayer().editSignature(req.getSignature());
+        
+        return this.encodeMsg(NetMsgId.player_signature_edit_succeed_ack);
+    }
+
+}