Warning fixes (#5275)

* Warning fixes in Robust.Shared

* Robust.Client warning fixes

* Fix test failure

Test failures were due to broken system registrations for the client RobustUnitTest. It was accidentally registering some server systems, which means DebugPhysicsSystem wasn't gettings its dependencies properly.

Fixing this meant pulling half a dozen extra dependencies that client ContainerSystem and TransformSystem are supposed to have, but didn't.

Robust.Shared/Network/HappyEyeballsHttp.cs

@@ -115,7 +115,7 @@ internal static class HappyEyeballsHttp
             await socket.ConnectAsync(new IPEndPoint(address, port), cancel).ConfigureAwait(false);
             return socket;
         }
-        catch (Exception e)
+        catch (Exception)
         {
             // Log.Verbose(e, "Happy Eyeballs to {Address} [{Index}] failed", address, index);
             socket.Dispose();

Robust.Shared/Network/NetEncryption.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Buffers;
-using System.Runtime.InteropServices;
+using System.Buffers.Binary;
 using System.Threading;
 using Lidgren.Network;
 using SpaceWizards.Sodium;
@@ -60,11 +60,10 @@ internal sealed class NetEncryption
             ciphertext = message.Data = new byte[encryptedSize];
         }
 
-        // TODO: this is probably broken for big-endian machines.
         Span<byte> nonceData = stackalloc byte[CryptoAeadXChaCha20Poly1305Ietf.NoncePublicBytes];
         nonceData.Fill(0);
-        MemoryMarshal.Write(nonceData, ref nonce);
-        MemoryMarshal.Write(ciphertext, ref nonce);
+        BinaryPrimitives.WriteUInt64LittleEndian(nonceData, nonce);
+        BinaryPrimitives.WriteUInt64LittleEndian(ciphertext, nonce);
 
         CryptoAeadXChaCha20Poly1305Ietf.Encrypt(
             // ciphertext
@@ -93,10 +92,9 @@ internal sealed class NetEncryption
         var buffer = ArrayPool<byte>.Shared.Rent(cipherText.Length);
         cipherText.CopyTo(buffer);
 
-        // TODO: this is probably broken for big-endian machines.
         Span<byte> nonceData = stackalloc byte[CryptoAeadXChaCha20Poly1305Ietf.NoncePublicBytes];
         nonceData.Fill(0);
-        MemoryMarshal.Write(nonceData, ref nonce);
+        BinaryPrimitives.WriteUInt64LittleEndian(nonceData, nonce);
 
         var result = CryptoAeadXChaCha20Poly1305Ietf.Decrypt(
             // plaintext