Project roadmap + discussion

[deadlocklogic]

Hi, and thanks for this great library. Just a question more than an issue: Will this project ever have a comeback, a roadmap? I am not necessarily implying the implementation of new features (the project is almost feature complete), but just regular patches/bug fixes. It is understandable that you are maybe busy or working on projects with higher interest not finding time for maintenance.

For what is concerning:

• Error messages suffered a significant drawback from a previous PR .
• Static/global variables aren't working well when passed as reference. (At least 5 opened related issues in the tracker).
• Many incompatibilities/weird behavior when using MSVC especially with unique usertypes.
• Unique usertypes used to accept nil, not anymore.
• Some behavior changed without a prior notice or changelog.

Suggestion:

• Allow/encourage github discussions for questions/non bug issues.
• Create a roadmap maybe with paid milestones.
• The docs are missing many notes/undocumented features, maybe use the community's help to improve the docs.
• Add a showcase of projects using sol2.
• Add tests for each closed issue with non trivial fix?
• Implement code coverage??

Thanks again.