Blueprint can now "infer" the type a closure returns, as long as it is not the property of a custom GType, so some of the casts (e.g. `as <string>`) will not be necessary anymore Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/733>
dim-label
dimmed
`dim-label` is deprecated. Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/624>
This was mostly done with `blueprint-compiler port`. Since Blueprint doesn't know about custom templates, I had to manually change some values from strings to literals. Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/567>