Mostly fixes, but I implemented the SteamNetworkSocket stuff into Rust so there's been some changes and additions there too.

Changes

• Add Steamworks.Dispatch.OnDebugCallback
• Fixed Dispatch not stopping properly when Server/Client Shutdown
• Now throws an exception is try to initialize more than once
• Fixed SteamFriends events not being hooked
• Fixed SteamServer events being hooked twice
• Added SteamNetworkingUtils.ConnectionTimeout
• Added SteamNetworkingUtils.Timeout
• Renamed SteamNetworkingUtils.GetConfigInt to SetConfigInt
• Fixed dispatch double callbacks when server initialized
• Added a bunch of functions/properties to NetIdentity
• Added a bunch more functions to NetAddress
• ConnectionInfo exposes NetAddress, NetIdentity
• Rename SocketInterface to SocketManager
• Rename ConnectionInterface toConnectionManager
• Fixed Sockets created using CreateRelaySocket not receiving messages
• Added interface versions of Connection/SocketManagers
• Removed SteamClient.OnCallbackException
• Removed SteamServer.OnCallbackException
• Added Dispatch.OnException
• Fixed Leaderboards returning corrupt results under Unity
• Added SteamNetworkingUtils.SendBufferSize