Exploratory: Alternative Node.js target implementation

[Frixuu]

This approach requires app devs to depend on deasync, a small native Node module that allows some of the code to be blocking.

Additionally:

• Made TCP dependency more obvious, since it is the main thing that needs to be ported between targets
• Adjusted test cases to work on both Node and Hashlink (but did not move them to a testing framework like utest/tink/buddy)
• Updated editor configuration and CI workflow
• The library still works on Haxe 4.2.0 (released February 2021)

[PXshadow]

Hey sorry going to go through and review all of your prs now. I greatly appreciate the effort you put into them @Frixuu , and I hope to get them all merged very swiftly, as I like the direction of the pull requests, and you have written very nice code.