Implement CMsgIPAddress

[xPaw]

• Obfuscation for ipv6 is implemented
• NetHelpers.TryParseIPEndPoint doesn't support IPv6 bracket notation
• LoginID in logon just sets v4 - i don't think this a big of an issue
• CMsgGSServerType has deprecated_game_ip_address, but there are no other fields for IP

I can't test any of this because there's no way of getting ipv6 cm servers anywhere yet.

[codecov]

Codecov Report

Merging #770 into master will increase coverage by 0.18%.
The diff coverage is 44.06%.

@@            Coverage Diff             @@
##           master     #770      +/-   ##
==========================================
+ Coverage   22.89%   23.07%   +0.18%     
==========================================
  Files          95       95              
  Lines        9283     9368      +85     
  Branches      779      784       +5     
==========================================
+ Hits         2125     2162      +37     
- Misses       7024     7071      +47     
- Partials      134      135       +1     

Impacted Files	Coverage Δ
.../Steam/Handlers/SteamGameServer/SteamGameServer.cs	18.81% <0.00%> (+0.36%)	⬆️
...Kit2/Steam/Handlers/SteamMasterServer/Callbacks.cs	0.00% <0.00%> (ø)
...am/Handlers/SteamMasterServer/SteamMasterServer.cs	15.90% <0.00%> (ø)
...team/Handlers/SteamMatchmaking/SteamMatchmaking.cs	3.77% <0.00%> (ø)
...t2/SteamKit2/Steam/Handlers/SteamUser/Callbacks.cs	2.89% <0.00%> (+0.11%)	⬆️
...t2/SteamKit2/Steam/Handlers/SteamUser/SteamUser.cs	25.30% <0.00%> (-0.10%)	⬇️
SteamKit2/SteamKit2/Util/Utils.cs	38.80% <57.77%> (+13.80%)	⬆️
...Kit2/Steam/Handlers/SteamWorkshop/SteamWorkshop.cs	9.34% <0.00%> (-2.99%)	⬇️
SteamKit2/SteamKit2/Types/DepotManifest.cs	0.00% <0.00%> (ø)
... and 5 more

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[yaakov-h]

My guess on CMsgGSServerType is that they're implementing IPv6 Steam infrastructure before implementing IPv6 game server support.

[xPaw]

I added method extensions onto CMsgIPAddress, didn't do it on IPAddress.

[yaakov-h]

Not entirely sold on the RollForward but I think the v6 stuff looks right now.

[yaakov-h]

NullReferenceException in the extension method because public_ip is null.