Isubrip

Added:
* AppleTV movie URLs are now supported.
* Added a `merge-playlists` config option to treat multiple playlists that can be found on AppleTV pages as one (more info on the example config).

Changes:
* Improved subtitles parser to perserve additional WebVTT data.
* The config value `user-agent` under `scraping` is now separated to 2 different values: `itunes-user-agent`, and `appletv-user-agent`.

Bug Fixes:
* Fixed movie titles with invalid Windows file-name characters (example: '?') causing a crash. ([Issue 14](https://github.com/MichaelYochpaz/iSubRip/issues/14))
* Fixed iTunes store URLs without a movie title not working. ([Issue 13](https://github.com/MichaelYochpaz/iSubRip/issues/13))
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Added:
* Replaced FFmpeg usage for parsing with a native subtitles parser (downloads are much faster now).
* Added a `remove-duplicates` configuration remove duplicate paragraphs. (Was previously automatically fixed by FFmpeg.)
* Added `fix-rtl` and `rtl-languages` configuration to fix RTL in RTL-languaged subtitles (has to be enabled in the config).

Changes:
* FFmpeg is no longer required or used, and all FFmpeg-related settings are deprecated.

Notes:
* `fix-rtl` is off by default and has to be enabled on the config. Check the `config.toml` example file for more info.
* Minimum supported Python version bumped to 3.7.
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Bug Fixes:
* Fixed subtitles being downloaded twice, which causes long (doubled) download times.
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Bug Fixes:
* Fixed a compatibility issue with Python versions that are lower than 3.10.
* Fixed downloading subtitles to an archive file not working properly.
* Fixed a bug where the code continues to run if subtitles download failed, as if the download was successful.
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Added:
* A note will be printed if a newer version is available on PyPI (can be disabled on the config).
* Config will now be checked for errors before running.

Changes:
* Big improvements to scraping, which is now far more reliable.
* Added release year to subtitles file names.
* Config structure slightly changed.

Notes:
* If you use a user-config, it might need to be updated to match the new config structure.
Example of an updated valid structure can be found [here](https://github.com/MichaelYochpaz/iSubRip/blob/main/config.toml).
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The script is now a Python package that can be installed using pip.

Added:
* Added a config file for changing configurations. (Example can be found [here](https://github.com/MichaelYochpaz/iSubRip/blob/main/config.toml))
* Added an option to choose subtitles format (vtt / srt).
* Added an option to choose whether to zip subtitles files or not.
* Multiple links can be passed for downloading subtitles for multiple movies one after another.
* Temporary files are automatically removed if the script stops unexpectedly.

Changes:
* A complete code overhaul from a single python script file to a package, while utilizing OOP and classes.
* Improved scraping algorithm for faster playlist scraping.
* FFmpeg will now automatically overwrite existing subtitles with the same file name.

Bug Fixes:
* Fixed a bug where in some cases, no subtitles were found since the title has HTML escaped characters, which causes bad matching when checking if a valid playlist was found.
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