Support the new distribution handshake

[igoralmeida]

Hi,

This PR allows CLERIC to connect to elixir once again. It does so by using the new handshake messages and pretending that it supports all the capabilities iex requires.

I haven't tested this thoroughly because I don't fully understand what each capability means.

It is possible, however, to (a) connect to iex with remote-node-connect; (b) send messages using reg-send; and (c) receive messages with receive-node-messages. Doing these things requires https://github.com/flambard/cl-erlang-term/pull/7

Like the other PR, this is not really intended to be merged as-is, more for gathering comments and preventing bit-rot.

Cheers