Support connecting directly to Erlang/OTP nodes

[oubiwann]

Tasks:

• [ ] Preparation:
  • [ ] build eixx and run test node example
  • [ ] build basic VCV plugin template
  • [ ] explore widgets (drop-down, outputs)
  • [ ] explore creating utility functions
  • [ ] add function for getting epmd node list
  • [ ] design panel
• [ ] Providing a text field where users can set the Erlang node name
• [ ] Accept CV/Oct and make RPC call to remote node with voltage data
• [ ] Accept Poly data for same
• [ ] Accept clock pulse and make RPC call to remote node with data
• [ ] Accept BPM (-2V to ~1.3V) and make RPC call to remote node with data
• [ ] Accept clock pulse and make RPC call to remote node with data
• [ ] Accept start/stop/run and make RPC calls to remote node with data

Development Resources:

• https://vcvrack.com/manual/PluginDevelopmentTutorial
• https://vcvrack.com/downloads/ (SDK downloads)
• https://github.com/saleyn/eixx
• https://www.erlang.org/doc/man/ei.html
• https://github.com/erlang/epmd/blob/master/src/epmd_srv.erl#L107
• https://github.com/adamtornhill/tinch_pp/blob/8cff964039b1d0e8fa69b5f6f67a39a4fcb692e4/impl/epmd_requestor.cpp
• https://vcvrack.com/manual/Panel