[Once development] RakNet switch

[<Cir...@cs...>]

OK Folks, in a few minutes I will commit the changes which switch us =
from HawkNL to RakNet.  Here is the list of substantial changes and =
issues which have come in (and which I can still remember):

1. We now use UDP - no TCP packets whatsoever.

2. You will need to update your build.cfg and SConstruct - there are =
only minor changes to replace 'hawknl' with 'raknet'.

3. When testing with server/client on a single computer, we seem to =
still have a similar problem as with HawkNL - chiefly that the client =
hangs while updating and needs to be restarted.  With HawkNL there were =
2 issues:  overfull transmit buffer and static receive buffer in the =
Once net layer.  Since the problem recurrs in RakNet, it must be an =
overfull transmit buffer issue.  Someone has to look at a sensible =
scheme for buffering data to be transmitted; remember that we can't =
buffer indefinitely or else each newly logged in client may have all the =
update files queued for transmission, which is very bad news.  So, it's =
not such a simple problem and we will need a universal solution because =
the net can be incredibly busy when there are many players logged on.

4. I almost forgot: You need 'RakNet' from =
http://www.rakkarsoft.com/#Downloads

5. The login code is currently broken (because the definition of 'conn' =
has changed) and I have removed conn->username/charname.  This will =
remain broken until mafm fixes it.

6. The way packets are managed has changed dramatically.  Before, we had =
an ocNetWorkManager* conn, and we could call various methods from =
'conn'.  Well, 'conn' is now a 'PlayerID'  (struct from RakNet) and all =
requests to transmit messages go to the ocServerNetworkMgr or =
ocClientNetworkMgr objects.  Also, when you send a packet it may now be =
'reliable' and in the future may also have a 'timestamp' - although at =
the moment I have no idea what we would use a timestamp for.


Do not expect to be able to connect to the public server using this new =
code until mafm updates the server.

- pinniped