simplify subtitle/audio script-opts

[CogentRedTester]

Simplifies the subtitle/audio extension script-opts.

Pinging @dyphire for thoughts.

[dyphire]

No longer use the extension blacklist?

Although I was also skeptical about the necessity of the blacklist of subtitle extensions at the beginning, what is the reason for the cancellation of the blacklist of audio extensions?

[CogentRedTester]

It hasn't been cancelled. Instead of using a whitelist/blacklist we just make the script-opt the actual list of all valid extensions. So you can add any extension, or remove any of the default extensions. This wasn't possible for the main extension list because it is so long, but for subtitles and audio tracks there are so few extensions it can be done without much hassle. This way it's really clear what the defaults are as well.

[dyphire]

It hasn't been cancelled. Instead of using a whitelist/blacklist we just make the script-opt the actual list of all valid extensions. So you can add any extension, or remove any of the default extensions. This wasn't possible for the main extension list because it is so long, but for subtitles and audio tracks there are so few extensions it can be done without much hassle. This way it's really clear what the defaults are as well.

You're right. Users can choose to use the automatic configuration matching folder to modify the relevant extended list, which is the same as the previous blacklist behavior.

[CogentRedTester]

Do you have any objections to me changing it to this? I think it's simpler and neater.

[dyphire]

Do you have any objections to me changing it to this? I think it's simpler and neater.

I also think this change looks good.