Use a dictionary instead of a list to find a user

[SadPencil]

xna-cncnet-client/DXMainClient/DXGUI/Multiplayer/GameLobby/CnCNetGameLobby.cs

Line 1551 in 53f0284

var user = connectionManager.UserList.Find(u => u.Name == pInfo.Name);

new Dictionary<string, IRCUser>(StringComparer.InvariantCultureIgnoreCase)

or

new UnsortedUserCollection<IRCUser>()