Add support for remote scanning via custom TCP

[vtnerd]

This is the first cut at remote scanning in LWS. It took a while to complete because a custom TCP implementation using ASIO was done - ZMQ sockets were too limited in their capabilities for the task.

There's lots of code here, so I will leave for a bit as I perform additional testing on this, including performance tests. I'm still uncertain on how this will perform with lots of accounts, etc.

[vtnerd]

This last force push:

• Rebased against develop
• Fixed exception bug for socket.remote_endpoint calls
• Fixed exception bug for socket.close calls
• Called socket.shutdown before socket.close for better platform compliance
• Use libsodium password hashing library and memory compare to prevent password leakage.

[vtnerd]

Finally ran a timed comparison test with 1000 accounts. A Ryzen 3900x saw a 5 minute drop in scan time when two laptops were added to the mix. The laptops took longer, but that is only due to the comparatively slower single threaded CPU performance. The added stress on momerod didn't impact performance negatively.

Looks like this patch will be merged, as it works as expected. I may tweak some of the parameters - most notably the threshold for remote scanning to be initiated.