Add filtering for Pirate ROMs, add exclude and avoid options

Calling the previous --blacklist option a "blacklist" was a bad choice, as it was not filtering out ROMs, but rather avoiding them.

Not the option has been renamed to --avoid and a new option for actually excluding ROMs was added with --exclude.

You can now also use those as regular expressions with the --regex option.

I also added a --no-pirate option to filter out Pirate ROMs. This is also activated with --no-all.