feat: add model switching (#75), close #3

[theUpsider]

Select a set of models to share. Implementing feature request: https://github.com/sdwebui-w-horde/sd-webui-stable-horde-worker/issues/3

• saves the currently selected models in a config with their corresponding name.
• added a multi select dropdown to choose from local models. When selecting, hash gets compared to remote hash.
• added override model checkpoint to parameters in order to swap model on the fly
• better state status by adding model and sampler of request
• targeted Sygil-Dev no longer the source for nataili as well. Was only one line of code.

  Description

Type of changes

• [X] Bugfix
• [X] Feature
• [ ] Refactoring
• [ ] Optimization
• [ ] Documentation
• [ ] CI/CD
• [ ] Other

I implemented Sygil-Dev no longer the source for nataili as well.

Please check the following items before submitting your pull request

• [X] I've checked that this isn't a duplicate pull request.
• [X] I've tested my changes with the latest SD-Webui version.
• [X] I've format my code with black: black .
• [X] I've lint my code with flake8: flake8 .
• [X] I've read the Contribution Guidelines
• [X] I've read the Code of Conduct

[theUpsider]

Please feel free to suggest any code changes. I tried to stick as close to your coding convention as possible.

[MaikoTan]

Thanks very much for the PR. I didn't test it locally but it looks good. Sorry I am busying these days and didn't even take a look here.

[theUpsider]

That's weird. Locally the flake linting finished without problems. Gotta love it. Should work now.