D19994: Add microphone indicator

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Shows a System Tray icon when the microphone is being used.
  It also indicates the default microphone volume as well as middle click to mute and wheel for adjusting the volume.
  The microphone icon only shows muted when *all* microphones are muted.

TEST PLAN
  F6715292: Screenshot_20190323_140703.png <https://phabricator.kde.org/F6715292>
  F6715294: Screenshot_20190323_140732.png <https://phabricator.kde.org/F6715294>
  Tried both alsa and pulseaudio apps, everything I tried ended up spawning an indicator.
  Didn't manage to read raw from `/dev/snd/...`

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D19994

AFFECTED FILES
  CMakeLists.txt
  applet/contents/ui/main.qml
  src/CMakeLists.txt
  src/qml/microphoneindicator.cpp
  src/qml/microphoneindicator.h
  src/qml/plugin.cpp

To: broulik, #plasma, #vdg
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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