Use ArgumentNullException.ThrowIfNull helper method

Did a simple search/replace on the whole repo (except the RSSDP project)
This reduces LOC and should improve performance (methods containing a throw statement don't get inlined)

```
if \((\w+) == null\)
\s+\{
\s+throw new ArgumentNullException\((.*)\);
\s+\}
```

```
ArgumentNullException.ThrowIfNull($1);
```

Emby.Server.Implementations/Net/SocketFactory.cs

@@ -63,10 +63,7 @@ namespace Emby.Server.Implementations.Net
         /// <inheritdoc />
         public ISocket CreateUdpMulticastSocket(IPAddress ipAddress, int multicastTimeToLive, int localPort)
         {
-            if (ipAddress == null)
-            {
-                throw new ArgumentNullException(nameof(ipAddress));
-            }
+            ArgumentNullException.ThrowIfNull(ipAddress);
 
             if (multicastTimeToLive <= 0)
             {