Use spatial Moran Processes throughout

Also add ability to pass a prob_end to the Matches.

- Add ability for a graph to add loops.
- Ensure reproduction graph is same as inter graph
- Remove Match class option from Moran process.
- Uncomment property based test. Slipped by in a previous commit on this branch
  as a mistake.
- Fix docstrings and add type hints. Addresses #808. Changed
  `fitness_proportionate_selection` to make mypy happy.
- s/random.seed/axelrod.seed
- Fix docs
- Add numerous tests. No specific interactions tests: I feel this is
  fairly well covered now with some behaviour specifically tested as well.