Tidying the play codes

[markromanmiller]

Hi team,

I'm in the middle of writing out some regex to parse the play codes (e.g, K, SB2, W, HR/89/F.2-H;1-H) into a tidier format, and I was wondering if that would be useful for this package. If so, I can make a pull request when I've fleshed out the code.

Mark

[colindouglas]

Hi Mark, I'd absolutely consider any PR you made for tidying up the play codes. They're pretty confusing if you're not familiar with them, and something easy clean them up would definitely be useful!