feedback-vibra: Add support for patterns

Add a new class that takes an array of durations and magnitudes.
A magnitude of 0 indicates a pause.

We can consider dropping the VibraRumble class at some point as that
is a special case of VibraPeriodic now however as the feedbacks are
encoded in the themes let's make sure VibraPattern is good API before
deprecating VibraRumble.

Signed-off-by: Guido Günther <agx@sigxcpu.org>

src/meson.build

@@ -30,6 +30,7 @@ sources = [
   'fbd-feedback-sound.c',
   'fbd-feedback-theme.c',
   'fbd-feedback-vibra.c',
+  'fbd-feedback-vibra-pattern.c',
   'fbd-feedback-vibra-periodic.c',
   'fbd-feedback-vibra-rumble.c',
   'fbd-theme-expander.c',