[in progress] Node.js Runtime Support

[KernelDeimos]

Phoenix shell was first built to work in Puter's terminal emulator, but we want it to be able to run locally on other systems as well.

Note: some of these tasks are done but not fully tested yet

Checklist:

• [x] de-couple cross-document messaging from launchPuterShell
• [x] Add NodeStdioPTT
• [x] Add filesystem platform support for node
  • [x] filesystem.readdir
  • [x] filesystem.stat
  • [x] filesystem.mkdir
  • [x] filesystem.read
  • [x] filesystem.write
  • [x] filesystem.rm
  • [x] filesystem.rmdir
  • [x] filesystem.move
  • [x] filesystem.copy
• [ ] Update builtins
  • [x] ls
  • [x] cp
  • [x] mkdir
  • [x] touch
  • [ ] (... this list is incomplete)
• [ ] Add a command provider for $PATH executables

[AtkinsSJ]

The filesystem platform support can be checked off now I think.