Add PulseAudio plugin

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
j4status: Fix type in log handler

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
flat: Add a setting to enable colours

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
flat: Actually use our Align setting

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