[EGD-6118] BT low power initial implementation

The `Pure`'s power consumption was measured in three variants:
 * BT off
 * BT on (master)
 * BT on (EGD-6118)

Measurement results (respectively):
* idle [mA]:
 ** 78-81
 ** 83-85
 ** 78-81

* BT headphones connected [mA]
 ** -
 ** 85-87
 ** 82-85

* music play [mA] (may be not precise)
 ** 90-100
 ** 98-105
 ** 101-115

[EGD-6166] HSP ringing

Added HSP ring sound on incoming call event while
there's bluetooth connection active and HSP is
selected as the current profile.
Possibility of pick up/decline the call using
BT device buttons added.
Slightly changed HSP initialization according
to the UML-s added.
Changed call hangup handler in service cellular.

[EGD-6401] Fix bluetooth initialization

Fixed multiple initialization in A2DP and HSP profiles.

[EGD-6507] Enable per-module testing

Add per-module:
 - test build
 - test execution
 - coverage reporting (xml/html).

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

[EGD-5742] Add audio format checking

Check if decoder's file format is supported by the sink audio device
before playing the sound. Add list of supported formats to each of audio
devices.

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

[EGD-6350] Added bluetooth device volume control

Bluetooth device volume control can be set by Pure Phone
while paired and is in A2DP mode. Temporarly disabled
HSP since it's not fully working and causing control issues.

[EGD-5260] Add A2DP playback to audio

Add basic playback capability using Bluetooth A2DP profile.
Only stereo/44100/16bit files are supported at the moment

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

[EGD-6190] Fix Bluetooth DMA transmission

Enabled previously FIFO buffer without proper handling caused
ignoring one byte. Disabling FIFO fixes this issue

[EGD-5945] Bluetooth-harness API messages

This PR:
* provides Bluetooth-Harness API messages definition [EGD-5944]
* provides Bluetooth-Harness API messages implementation
* provides Bluetooth-Harness API usage on harness side [EGD-5946]
* provides Bluetooth-Harness tests [EGD-5947]

[EGD-5954] Add CoD verification for bluetooth conn

Implement selective profile connection based on Class of Device

[EGD-5952] Changed service stack depths acc. to real usage

Stack depth changed for:
- Application Manager
- Service Bluetooth
- Bluetooth Worker
- Service Eink
- Service GUI
- Application Special Input

[EGD-6100] Add BT device turn off handling

After BT device disconnects (e.g. because of shutdown) Pure is now
aware of this

[EGD-6073] Fix text formatting in retry windows

Error message in retry windows was displayed incorrectly.

[EGD-6024] Return to All Devices window after attempt to retry action

Execution of retry pairing/unpairing/connecting took too long
to wait for it on retry popup. Fixed minor bugs.

[EGD-5986] Fix re-enabling BT scan

Due to incorrect stopping the BT scan, re-enabling it caused
failure to HCI state machine, which was indirect cause of failing
connections. Now it works

[EGD-5984] Add BT implementation of added GUI actions

Implemented BT-side actions for GUI usage, e.g. connection status

[EGD-5940] Add BT device unpairing

Implemented possibility to forget/unpair a device via GUI

[EGD-5982] Fix no window refresh after pairing

Fixes no refresh after finished scan

[EGD-5981] Fix BT scan stop issue

Btstack's scan stop call was not working properly thus force stop
function has been added

[EGD-5980] Fix BT paired devices list

After pairing more than 1 device the paired device list showed
only the last paired. This commit fix this issue