Implement setting player skin

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

@@ -0,0 +1,28 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.PlayerSkinShow.PlayerSkinShowReq;
+import emu.nebula.net.HandlerId;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.player_skin_show_req)
+public class HandlerPlayerSkinShowReq extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Parse req
+        var req = PlayerSkinShowReq.parseFrom(message);
+        
+        // Set player skin
+        boolean success = session.getPlayer().setSkin(req.getSkinId());
+        
+        if (success == false) {
+            session.encodeMsg(NetMsgId.player_skin_show_failed_ack);
+        }
+        
+        // Encode and send
+        return session.encodeMsg(NetMsgId.player_skin_show_succeed_ack);
+    }
+
+}