Realised I don't need the CharacterFrameList class. It overcomplicates it, I can make do with an array.
Added a test for an array of two character's move lists and frame data.
Just some minor refactoring of TestFormatConverter
Added a FileOperations utility class. It's basically just wrapping PHP inbuilt functions but with the option to add some complexity like I did with deleteDirectory. Added tests, although I've been a bit bad and wrote some functions without writing the tests first.