Split requirements.txt to factor out hypothesis and prompt_toolkit

[marcharper]

To address #1379, this PR defines three installation options for requirements:

• base/default -- everything except hypothesis and prompt_toolkit
• human -- includes prompt_toolkit
• development -- includes hypothesis and prompt_toolkit

Once merged and released, the different variants can be installed like so:

pip install axelrod[Human]

with the default case not requiring specification (e.g. pip install axelrod). I tested the variants and warnings locally in a venv but didn't add explicit tests to CI.

Strategy import is updated to check for the presence of prompt_toolkit and include the Human strategy or not accordingly (and with a warning to the user that it's not available, when applicable).

I wasn't sure whether to include prompt_toolkit by default (the Human strategy is nice for live demos). We could go that route and instead have

• base/default -- everything except hypothesis
• non-human (or minimal?) -- everything except hypothesis and prompt_toolkit
• development -- everything

We could define further variants (e.g. don't import any plotting functions) if desired.

Fixes #1379

[marcharper]

os.listdir("requirements/") returns a list. I can tweak the file and get to it run; but why the codes work for you but not for me?

There were a couple of issues actually. I was using pip install instead of setup.py, but it seems like it should not have worked for me locally anyway (given the list vs context manager error you got). I rewrote setup.py to use pathlib and fixed that issue.

Also, there's a difference in the pip command for the package on pypy and what you'll need to use locally. I updated the documentation with the correct command.

I think it's possible to use setup.py directly, with a command like the following, but it didn't work for me locally, and easy_install is deprecated, so I'm sticking with pip.

python setup.py install easy_install "axelrod[human]"

[Nikoleta-v3]

Perfect 🚀 The setup.py file now works.

Regarding pip, since I am using zsh I have to run,

pip install .\[development\]
# or
pip install ".[development]"

instead of pip install .[development]. Not sure if we want to mention it in the docs.

[drvinceknight]

The failure of the CI looks like a specific check we had implemented to make sure no strategies were forgotten along the way:

Run python -m pip install pylint
[2](https://github.com/Axelrod-Python/Axelrod/actions/runs/3864735683/jobs/6587748984#step:11:2)
  python -m pip install pylint
[3](https://github.com/Axelrod-Python/Axelrod/actions/runs/3864735683/jobs/6587748984#step:11:3)
  python -m pylint --disable=all --enable=unused-import axelrod/strategies/_strategies.py
[4](https://github.com/Axelrod-Python/Axelrod/actions/runs/3864735683/jobs/6587748984#step:11:4)
  shell: /usr/bin/bash -e {0}

I'm guessing this is something that can be addressed by including a pragma somewhere.

Happy to take a look if that would be helpful.