Library is configured to compile as 'lite'.

… into NetCon

* Full CNetAdr rewrite (protocol agnostic)
* Full CSocketCreator class rebuild (based on Valve's implementation)
* RCON implementation on server and client
* Misc cleanup

Fixed several small bugs

Allows users to connect to their dedicated servers without having the game installed. Its also a base for example for anyone that wants to create their own RCON client.

Quote marks where only necessary when passing input directly to CCommand. Small mistake

* Buffers are now send properly from the game client and netconsole client (running scripts and executing command's/convar's now work properly).
* Removed 'PASS' string check on server and only rely on 'SERVERDATA_REQUEST_AUTH' enum for auth queries (should make heavy abuse even harder).

Don't run CheckForBan each iteration if no failed attempts are made

If the vtable pointer points to ConVar its not a command

Use const qualifiers for CNetAdr2 methods.
Removed redundant code in CNetAdr2.
Add proper destructor for CRConServer, CRConClient and CNetCon.

Included in more recent commits from upstream, but these should be in the PCH.

… into NetCon

'rcon PASS' will use the 'rcon_password' convar as password to auth with the server.
'rcon PASS yourpassword' will use the third argument from CCommand to auth with the server.

* Implemented robust length-prefix framing logic for non-blocking sockets (previously used character sequences to determine length, but you cannot use character sequences on protocol buffers as its binary data. This logic should fix all problems regarding some commands not getting networked properly to the server and stuff not getting printed on the client).
* Increased buffer size to std::vector::max_size when netconsole is authenticated (MAX_NETCONSOLE_INPUT_LEN still remains enforced on accepted but not authenticated connections to prevent attackers from crashing the server).
* Process max 1024 bytes each recv buffer iteration.
* Additional optimizations and cleanup.

…E is submitted

Addressed:
* 'Expression: vector subscript out of range' (we only ever ensured capacity upon construction).
* 'Run-Time Check Failure #2 - Stack around the variable 'buf' was corrupted.' (caused because of 'misuse' of sprintf_s, which was initially used to suppress microsoft compiler warnings, reverted to sprintf).

The solution compiles on all systems, but CI. The cause happens to be the "net.h" include in cl_rcon.cpp. Perhaps moving it up higher fixes the problem (hopefully).

Hopefully this fixes CI.

Fix formatting errors