Glade misleads us into thinking we need these, but the
property is somewhat confusing in GTK3. In general we don't
want `can-focus` to be true for containers, as that will
break keynav for the children. For non-containers, the
defaults are appropriate.
Instead of manually setting `can-focus`, we should just
use the default values. GTK has sane defaults.
Fixes https://gitlab.gnome.org/GNOME/calls/-/issues/366
* src/ui/call-record-row.ui: Add menu, GtkPopover. Surround existing
elements with GtkEventBox to capture longpress/rightclicks
* src/calls-call-record-row.c: Provide functions emiting "call-delete"
signal, add widgets from ui file
* src/calls-record.c: Add "call-delete" signal
* src/calls-history-box.c: Add callback for "call-delete" signal
* src/calls-record-store.c: Add callback for "call-delete" signal
* src/util.c: Add convenience function calls_find_in_store for finding
items in ListModel
* src/util.h: Add declaration of calls_find_in_store
