pynetworktables NT3 rewrite now available for testing

[virtuald]

pynetworktables has been rewritten in the style of ntcore, and now fully supports all of the NT3 features that are available in ntcore. For the most part.... it should all work. There are a few breaking changes I can think of:

• Connection listeners are different. Sorry.
• The special array types are gone (yay) and so is the networktables2 package
• It's easier to make client connections (though the old way still works)
• ... and that's about it

I haven't had the opportunity to try this on a real robot yet, BUT the unit tests have 75% coverage and it works on my machine, so it's probably good to go if you're using this on a driver station or coprocessor. Try it out, let me know how it works!

Installation is super easy if you already have python and pip installed:

pip install --pre pynetworktables

Also, if you're using pynetworktables2js, there's an alpha release of that available too, which accommodates some of the NT3 changes. However, more work needs to be done to fully support all of the NT3 features in pynetworktables2js.