[cozytv] Add new extractor

[xFA25E]

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Before submitting a pull request make sure you have:

• [x] Searched the bugtracker for similar pull requests
• [x] Read adding new extractor tutorial
• [x] Read youtube-dl coding conventions and adjusted the code to meet them
• [x] Covered the code with tests (note that PRs without tests will be REJECTED)
• [x] Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• [x] I am the original author of this code and I am willing to release it under Unlicense
• [ ] I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• [ ] Bug fix
• [ ] Improvement
• [x] New extractor
• [ ] New feature

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Description of your pull request and other information

This PR provides an extractor for cozy.tv. It is a streaming service. It can extract only saved streams. Live-stream download is not implemented yet.

Example url: https://cozy.tv/<user>/replays/<id>

[xFA25E]

Thanks a lot! I really appreciate your detailed and helpful suggestions! I'm happy to contribute to one of my favorite open source projects

[rabfel-hobmet]

is there anything i can do to help this get done? would really appreciate this merged.

[xFA25E]

I've added an extractor for livestreams and removed useless info fields