New login process + a little bit of cleanup

No reliability required :) Will get to the client soon

Subsurface/Source/Networking/NetworkMember.cs

@@ -9,6 +9,23 @@ using Barotrauma.Items.Components;
 
 namespace Barotrauma.Networking
 {
+    enum ClientPacketHeader
+    {
+        REQUEST_AUTH, //ask the server if a password is needed, if so we'll get nonce for encryption
+        REQUEST_INIT, //ask the server to give you initialization
+        UPDATE_LOBBY, //update state in lobby
+        UPDATE_INGAME_ALIVE, //update state ingame while alive (allow character input)
+        UPDATE_INGAME_SPECTATING, //update state ingame while spectating/dead
+    }
+    enum ServerPacketHeader
+    {
+        AUTH_RESPONSE, //tell the player if they require a password to log in
+        AUTH_FAILURE, //the server won't authorize player yet, however connection is still alive
+        UPDATE_LOBBY, //update state in lobby (votes and chat messages)
+        UPDATE_INGAME_ALIVE, //update state ingame while alive (character input and chat messages)
+        UPDATE_INGAME_SPECTATING, //update state ingame while spectating/dead (chat messages)
+    }
+
     enum VoteType
     {
         Unknown,