Port websocket ('ws') support to V8 build of Spark / pxScene

[jmgasper]

We have recently done work to support V8 as a Javascript engine for pxScene. This work has shown it is a viable option. This challenge will expand the V8 integration to support the ws library:

https://github.com/gladish/pxCore/tree/master/examples/pxScene2d/external/uWebSockets-0.14.8

We did this previously as part of the __temp_RF_rtRemoteWebsocket branch. You can see the initial pull request and merge here:

#196

There are a few tests here that specifically use the 'ws' module and can be used for testing. Please use these on the default Node build of the app (or just download from pxscene.org) to compare with the fixed up V8 build:

• https://px-apps.sys.comcast.net/pxscene-samples/LabWeek/screensaver/ss_pp.js
• https://px-apps.sys.comcast.net/pxscene-cpc/screensaver/ss_sliding.js