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First iteration to achieve MESA compatibility.
As a side effect, we have removed `simpy`.

For a full list of changes, see `CHANGELOG.md`.

Documentation for the new APIs is still a work in progress :)

All tests pass but some features are still missing/unclear:

- Mesa agents do not have a `state`, so their "metrics" don't get stored. I will
probably refactor this to remove some magic in this regard. This should get rid
of the `_state` dictionary and the setitem/getitem magic.
- Simulation is still different from a runner. So far only Agent and
Environment/Model have been updated.

See CHANGELOG.md for a complete list of changes

See CHANGELOG.md for a full list of changes

* Removed nxsim
* Refactored `agents.NetworkAgent` and `agents.BaseAgent`
* Refactored exporters
* Added stats to history

Fixes #6

Update URLs to gsi.upm.es

Fix compatibility issues with newer networkx and pandas versions

1.3.0rc1 is not compatible with salib