Evolution-data-server recently bumped its dependency on libical from 1.0
to 2.0. Since we build e-d-s from Git in the Flatpak builder manifest,
we need to update the version of libical we build as well.
Currently this json file contains comments in C-style.
However, comments in json files are not allowed and they could
break external programs that make use of them.
To fix it, I removed any comment from org.gnome.Calendar.json file.
https://bugzilla.gnome.org/show_bug.cgi?id=781787
If using Builder 3.22.3, you can use this manifest to allow building
Calendar against the GNOME master SDK. This means that contributing to
Calendar can be as easy as installing Builder, cloning calendar, set the
manifest build preference,and Build/Run.
