Previously, using multiple track selection flags like `-S -A` would not work
as expected. The flags were treated as mutually exclusive, resulting in only
one type of track being downloaded.
This change refactors the track selection logic to properly handle combinations:
- Multiple "only" flags now work together (e.g., `-S -A` downloads both)
- Exclusion flags (`--no-*`) continue to work and override selections
- Default behavior (no flags) remains unchanged
Fixes#10
* Introduced a new configuration option for DRM decryption in `unshackle.yaml`.
* Updated the `decrypt` methods in `PlayReady` and `Widevine` classes to allow using `mp4decrypt`.
* Enhanced the `Config` class to manage decryption methods per service.
* Added `mp4decrypt` binary detection in the binaries module.
Original code by @p0llux12 - Discord
- Introduced `SurfsharkVPN` class for proxy service integration.
- Updated configuration to include `surfsharkvpn` in proxy providers.
- Removed legacy `nordvpn` configuration from YAML.
- Enhanced `dl.py` and `search.py` to utilize `SurfsharkVPN`.
* Introduced `SubtitleCodecChoice` to allow selection of subtitle codecs with support for enum names, values, and common aliases.
* Updated `--sub-format` option in `dl.py` to utilize the new `SubtitleCodecChoice`.
