- Support Gnome Shell 42.
- Drop compatibility with Gnome Shell 3.32. The earliest supported version is now 3.33.90.
- Fix version detection code to handle non-numeric versions (eg. 42.beta).
- Fix error at startup ("TypeError: this._overlays is null").
- Meson-gse update: Support js91, meson 0.61.
- Cleanups.