Scottish Election CVR Reader

[cdonnay]

There are some inconsistencies between csv files in the scot-elex repo. Specifically, the party names are not always provided in a consistent format. This causes issues when reading in names using the load_scottish function. See aberdeenshire_2017_ward12.csv and aberdeen_2022_ward12.csv for an example.

[cdonnay]

@peterrrock2 reformatted all of the data files and changed them to csv format. We also updated the load_scottish function to read the new format.