New Stdlib modules: Binary, Calendar, Erlang, Ets, Lists, Maps, and more

• Lots of work on the Stdlib, as visible in
  issue #8.

• External definitions now can override the name they will use in the
  generated source code with their string value

• Parser supports arbitrarily parenthesized expressions

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The idea for this pre-release is to start testing out how the Stdlib
feels to write some small programs and scan 1) whether some obvious FFIs
are missing, and 2) how straightforward it is to write new ones.