Pyprojectx

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Features & Improvements
- Generate platform independent pw.lock files
- Pyprojectx initialization of a clean project is up to 10x faster!
- 95 use uv instead of pip
- 104 support requirements from a pyproject.toml file or a text file with `-r`
- 105 allow installing prerelease versions of tools with `prerelease = "allow"`
- Dropped support for Python 3.8!

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Features & Improvements
- 100 add --clean option to cleanup virtual environments

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Bug Fixes
- 98 existing tool virtual environment is reused even if pw.lock changed

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Bug Fixes
- 96 fix locking of pyprojectx's own dependencies

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Bug Fixes
- 90 fix PowerShell activate script when symlinks are allowed on Windows

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Features & Improvements
- use an informative prompt when activating a tool context virtual environment

Bug Fixes
- 90 activate script doesn't work in windows PowerShell