1. Our builds include a version check which for stability does not rely
on build.sbt but instead on querying enso --version. Building the
engine takes a lot of time, so to save that time on failed builds,
we ensure that the launcher is built first (which is much faster)
and only if its version check succeeds, the engine build is
attempted. This is achieved by making the `build-engine` job in
`release.yml` depend on `build-launcher`.
2. Enso version is bumped to `0.1.0`.
1. This commit adds an extensive library for parsing commandline
arguments and formatting output.
2. It implements the expected CLI for the launcher.
3. It turns off parallel execution on the CI in hopes of making it
more stable.
4. It implements plugin support in the launcher.
