Build a standard date field for games from inferred and existing data

[BruceJohnJennerLawso]

This is much closer to reality than the very similar #129, since the dates are already broken up by month and day, so all thats really needed is to infer the year from year id already in the csv, convert months from short 3 character standard to number, and save.

Times are in the game files, which makes adding the times to the team csvs kinda pointless IMO, wont be adding those standard