SteamNetworkingSockets.SendMessages has incorrect parameter types; can't be called successfully

[Idles]

I was trying to put to use the newly-fixed connection lanes API and ran into something else; getting SIGSEGV in Unity when trying to call SteamNetworkingSockets.SendMessages.

The native method has this signature:

void SendMessages( int nMessages, SteamNetworkingMessage_t *const *pMessages, int64 *pOutMessageNumberOrResult );

The Steamworks.NET binding for that method has the signature:

public static void SendMessages(int nMessages, SteamNetworkingMessage_t[] pMessages, long[] pOutMessageNumberOrResult)

So looks to me like there's an issue with the pMessages parameter type. For other native APIs that take ** parameters, Steamworks.NET appears to use IntPtr[]. Seems like the fix should be similar to the one for #597

I did a search and wasn't able to find any projects on Github calling this method using Steamworks.NET, so it might not be in use by anyone else and thus went unnoticed