Isubrip

Bug Fixes:
* Fixed an issue where if the `logs` directory does not exist, the folder isn't created, causing an error. ([Issue 67](https://github.com/MichaelYochpaz/iSubRip/issues/67))
* Fixed an issue where the summary log of successful and failed download would not account for failed downloads. ([Issue 68](https://github.com/MichaelYochpaz/iSubRip/issues/68))
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Added:
* Added new `proxy` and `verify-ssl` settings to the config file, for allowing the usage of a proxy when making requests, and disabling SSL verification. See the updated [example config](https://github.com/MichaelYochpaz/iSubRip/blob/main/config.toml) for usage examples.

Changes:
* `subtitles.rtl-languages` config setting is no longer supported, and its values are now hardcoded and can't be modified.

Bug Fixes:
* Fixed an issue where in some cases, `STYLE` blocks would repeat throughout the subtitles file, and cause inaccurate cue count. ([Issue 63](https://github.com/MichaelYochpaz/iSubRip/issues/63))
* Fixed an issue where the WebVTT Style blocks would have their `STYLE` tag replaced with a `REGION` tag in downloaded subtitles.
* Fixed an issue where an empty playlist (with a size of 0 bytes) would be reported as a valid playlist with no matching subtitles. ([Issue 65](https://github.com/MichaelYochpaz/iSubRip/issues/65))
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Bug Fixes:
* Fixed an issue where errors would not be handled gracefully, and cause an unexpected crash. ([Issue 55](https://github.com/MichaelYochpaz/iSubRip/issues/55))
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Bug Fixes:
* Fixed an issue where source abbreviation was missing from file names of downloaded subtitles files. ([Issue 53](https://github.com/MichaelYochpaz/iSubRip/issues/53))
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Added:
* Added logs. See the new [Logs section in the README](https://github.com/MichaelYochpaz/iSubRip#logs) for more information.
* Added a new `subtitles.webvtt.subrip-alignment-conversion` config setting (which is off by default), which if set to true, will add the `{\an8}` tag at the start of lines that are annotated at the top (with the `line:0.00%` WebVTT setting) when converting to SubRip. ([Issue 35](https://github.com/MichaelYochpaz/iSubRip/issues/35))
* Implemented caching for AppleTV's storefront configuration data, which should reduce the amount of requests used when scraping multiple AppleTV URLs from the same storefront.

Changes:
* Big backend changes to the structure of the code, mostly to improve modularity and allow for easier development in the future, and improve performance.
* Updated the CLI output to utilize logs and print with colors according to log-level.
* Improved error handling in some cases where an invalid URL is used.

Bug Fixes:
* Fixed an issue where if a movie is a pre-order with a set release date, a message with availability date wouldn't be printed in some cases.
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Bug Fixes:
* Fixed an issue where some AppleTV URLs (or iTunes links that refer to such URLs) would not be matched in some cases, resulting in a "No matching scraper was found..." error. ([Issue 46](https://github.com/MichaelYochpaz/iSubRip/issues/46))
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