cleanup: Properly define arguments everywhere

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventd/config: Add _get_[locale_]string_with_default

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

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
sound: Change default sound setting to "sound-file"

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
dbus: Add sound capability support

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
sound: Rename the key Sound -> File

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
sound: Support D-Bus notifications sound-file hint

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
notify: Smarter defaults handling

Also really disable event when requested

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
plugins: New canberra plugin

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