Forward update from G:A to G:Factory - moving devel prj there

- Update to version 0.4.1:
+ Fixes an important issue tracking weak pointers from a
GtkTextBuffer.
+ Fixes an important issue where we could get invalid text iters
from GtkTextBuffer::delete-range() after the deletion occurred
when other signal handlers are in play.

- Update to version 0.4.0:
+ This is a stable release for GNOME 47.0.
+ Protect the SpellingEngine from systems with misconfigured
dictionaries.
+ Protect the SpellingTextBufferAdapter from NULL language codes.
+ Protect the SpellingJob from uncooperative break chars which
could result in zero length runs.
+ Fix some incorrect licenses.
- Changes from version 0.3.1:
+ Immediately clear tags for invalidated regions without
round-tripping to the checker thread.
+ Bump soname for ABI changes in 0.3
+ Fix licenses to be LGPLv2.1+
+ Add sysprof profiler marks for performance profiling
+ Update example so people know to copy the button-press work to
update the menu immediately.
+ Fix pkg-config fields
+ Fix libspelling usage from subproject
+ Make introspection building optional
+ Documentation improvements
- Pass sysprof=false to meson configure, do not build the profiler
support at this time.
- Add so_ver and api_ver define, and set them to 1-2 and 1