Imagecast

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- Added software tests for HTTP API and CLI
- Fixed HTTP API by downgrading to pydantic 1.x
- Removed support for Python 3.7
- Upgrade to pydantic-settings

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- Add capability to acquire images from HTML web pages, and elements thereof
- Remove support for Python 3.6
- Add support for Python 3.12

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- Update dependencies across the board
- Add support for Python 3.10 and 3.11

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- Add explicit ``--reload`` option to ``imagecast service`` for development mode
- Get rid of the "httptools" dependency
- Store the image format for later reuse directly after reading the original image
- Run black and isort on the code base
- Improve dependencies
- Improve documentation
- Add software tests

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- Use static response instead of streaming response aka. ``Transfer-Encoding: chunked``
- Improve HTTP caching

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- Add HTTP API