[CallActivity] now showes CallStatus: encrypting

  * This is part of issue #54.
[SoundEffectManager] added log showing play and preparation time

  * This is part of issue #54.
[SimlarService] now prepares encryption handshake sound on new call

  * This is part of issue #54.
[CallActivity] now sets microphone and speaker buttons on SimlarCallState change

  * This is part of issue #54.
[Volumes] added microphoneStatus: DISABLED, MUTED, ON

  * This is part of issue #54.