MaimMim Man in the middle minetest interceptor

- prototype
- between client and server, allow to capture all exchanges and potentially change them
- created to capture server maps in laby
- first test get only MapBlock, support version serialization version 28
  - prepartion for 29 with zstd but untested.

java/org/artisanlogiciel/games/minetest/net/ReliablePacketBuffer.java

@@ -0,0 +1,20 @@
+package org.artisanlogiciel.games.minetest.net;
+
+import org.artisanlogiciel.games.minetest.core.PacketException;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class ReliablePacketBuffer {
+
+    List<BufferedPacket> m_list = new LinkedList<>();
+
+    void insert(BufferedPacket packet, int nextExpected)
+    throws PacketException
+    {
+        //
+        int seqNum = packet.getSeqNum();
+        m_list.add(packet);
+    }
+
+}