eil: top-level

One of the things we may want to think about for erlang-in-lisp is a top level. In erlang, one can send and receive messages right at the REPL because it is a process with a mailbox. For us, we have to do some additional bookkeeping (thus the standard REPL is not an erlang-in-lisp process). This should be easy to implement and handy to some.

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