[EGD-6881] Fix HSP no sound

Fixed no sound during HSP call if there was bluetooth's device
button used to pick up the call.

[EGD-7149] Fix connecting BT devices

Some devices were giving different results after querying for
Class of Device (CoD) and our filters were too restrictive.

Now filtering only take place at pairing, so every suitable
device can be connected

[CP-264] Ensure bluetooth logging

Add missing logs with required information:
Pairing result and disconnecting bt device.

[EGD-7130] Renamed settings application

Renamed settings application.

[EGD-7108] Fix disconnecting all devices during unpairing

Due to wrong logic, all devices were disconnecing during unparing
Now, the disconnecting is performed only when the unpaired devices
is the connected one

[EGD-7081] Disconnect forgotten BT device

The device has to be disconnected prior forgetting

[EGD-7077] Don't allow for connecting more than 1 BT device at once

We don't have support for multiple connected devices
thus we shouldn't allow for this. This commit fixes
the issue

[EGD-7003] Removed sensitive data bt

Sensitive data removed from logs in module bluetooth
and service bluetooth.

[EGD-6514] HSP volume control

Bluetooth headset profile volume control
introduced. Small refactor on A2DP volume control
done.

[EGD-6972] Update BT stack to 1.4.1 version

This PR updates the BT stack to the newest version

[EGD-6882] Fix call hangup after BT device disconnect

Updated the BT stack with events that are handled through the
button so now it's possible to fallback to the earspeaker when
BT connection is lost

Added handling of those events

[BH-515] Create main Bell app

Create main Bell app

Merge branch 'master' into stable

[BH-373] Convert utils json into a lib

Moving json to a third-party standalone library.

[BH-378] PR changes

PR changes - mainly includes

[BH-378] Utils move log to library

Moved log to separate library

Merge branch 'master' into stable

[EGD-6049] Add voice call over HSP

Add support for voice calls over HSP.

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>

[BH-398] Move sml to a separate directory

Move sml to a separate directory

[EGD-6447] Add Bluetooth PIN pairing

Implemented legacy pairing using PIN code