1.0 stabilization tracker

[arnetheduck]

• Decide what to do with "experimental" API - ie enable-by-default, post-deprecation-warning, etc
• document API stability guarantees in general
• document Nim version support policy
• drop 1.2?
• deprecate in stew - chicken/egg problem (since stew per definition is a work-in-progress repo)
• port nim-stew issues / PR:s to here

[tersec]

I'd say drop 1.2, unsurprisingly. No legacy users of this as a separate library, no reason to start supporting it now.

[arnetheduck]

• create a sustainability / long-term maintenance plan