Windows support

[xobs]

This project is an excellent example of how to do graphical programs in Rust. Thank you for putting it together.

I'm running it under Windows, and have experienced a few issues:

1. valens config creates invalid paths: DATABASE = 'sqlite:///C:\Users\Sean\.local\share\valens\valens.db' -- the path separators should be double-escaped, or use forward slashes
2. Every time I try to do something, I get an error: Mismatch between frontend and backend version (, 0.1.dev303+gab3e487). This may lead to unexpected errors. Please close and restart the app.

I can open separate issues for these if you like, or if Windows is not a desirable target I can close this issue.

[treiher]

Thanks for your report!

1. valens config creates invalid paths: DATABASE = 'sqlite:///C:\Users\Sean\.local\share\valens\valens.db' -- the path separators should be double-escaped, or use forward slashes

The problem should be easy to fix. I will try to extend the CI tests to ensure the compatibility with Windows in the future.

2. Every time I try to do something, I get an error: Mismatch between frontend and backend version (, 0.1.dev303+gab3e487). This may lead to unexpected errors. Please close and restart the app.

The error message indicates that the version could not be determined correctly. In this project setuptools-scm is used for this purpose. setuptools-scm extracts the versions from the git metadata. If you are building the project from source only, this would explain the issue. The problem should not occur if you are building the project from the cloned repository.