ffmemless vibra plugin

Vibra plugin with kernel ff-memless vibra backend. features:

    - effect setup from ffmemless.ini
    - system level effect settings override from feedback.ini
    - fall-back default effect in case of missing effect data
    - configuration of policy from data/event.d/*.ini files by
      setting "ffmemless.effect" for each event which requires vibra
    - play / pause / stop according to configured policy
    - profile aware for "vibrating.alert.enabled" flag (no vibra
      playback if not enabled)
    - replaces immvibe plugin as default "media.vibra" resource

Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@jollamobile.com>