eventdctl: Fix segfault (again)

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
eventdctl: Add missing new lines

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
nd: Explicitly ask backend for its default target

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
nd: Store displays in a hash table

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
nd: Add "detach" command

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventd-evp: Use GLib enum helpers

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventd-test: Guard enum values

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>