Persistent validators holding tournament information

When returning ```read_skip_files``` from validators these are loading a list from the file that holds all of the files that should be skipped for a given dataset.

This means that it is not possible to count how much files are validated/skipped per replaypack.

Such implementation should be relatively simple in the following form when saving the persistent file:

```json
{
"Tournament_1": {"validated_files": ["file_n0", "file_n1"],
"skip_files": ["file_n2","file_n3"]},
"Tournament_2": {"validated_files": ["file_m0"],
"skip_files": []}

}
```