Improve logger for multiple runs

[ryanlewist]

Update logger to track multiple runs of the game. Currently, the logger writes and overwrites a log file with the results of a game, erasing the history of past games unless those log files are archived.

It would be good to log a few things, perhaps in a dataframe or json file: The results of the matches, the starting positions, and the movements between each node. This info could be useful for a ML implementation in the future.