* Initial commit

* Implemented a new systems of defining and running scenarios / portfolios. Scenarios and Portfolios can now be defined using JSON files similar to topologies. This allows user to define experiments without changing any KotLin code.

* Ran spotlessApply

This change updates the Capelin experiments so it can be distributed and
executed independently of the main OpenDC distribution. We provide a new
command line interface for users to directly run the experiments.
Alternatively, the `CapelinRunner` class encapsulates the logic for
running the experiments and can be used programmatically.

This change creates a new module for doing simulations with virtual
machine workloads. We have found that a lot of code in the Capelin
experiments code is being re-used by non-experiment modules.

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.