Ignorance does not respect Transport.enabled if the transport was disabled by another message within the same frame

[NarryG]

Continuing my trend of reporting the same issue in every single transport...

Certain code in Mirror (specifically the scene load code) is dependent on pausing the transport on the client/server to ensure messages don't get sent out of order. As such, there are two checks within Telepathy.

            // note: we need to check enabled in case we set it to false
            // when LateUpdate already started.
            // (https://github.com/vis2k/Mirror/pull/379)
            if (!enabled)
                return;

            // process a maximum amount of client messages per tick
            for (int i = 0; i < clientMaxReceivesPerTick; ++i)
            {
                // stop when there is no more message
                if (!ProcessClientMessage())
                {
                    break;
                }

                // Some messages can disable transport
                // If this is disabled stop processing message in queue
                if (!enabled)
                {
                    break;
                }
            }

In Ignorance, only the first check is in place https://github.com/SoftwareGuy/Ignorance/blob/master/Assets/Mirror/Runtime/Transport/Ignorance/IgnoranceThreaded.cs#L122 The second check is nowhere to be found.

This is most likely the cause of #58 as well.