v520.39.0

What's Changed

• Warn about links Blender can't evaluate when a tree is built by @BradyAJohnston in #277
• Keep layout edits across rebuilds by @BradyAJohnston in #278
• Keep a group's asset status when run_source replaces it by @BradyAJohnston in #279
• Keep keyframes and drivers across rebuilds by @BradyAJohnston in #280
• Keep a hand-edited tree when a rebuild replaces it by @BradyAJohnston in #281
• Call existing group classes from to_python by @BradyAJohnston in #283

Full Changelog: v520.38.0...v520.39.0