[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

[EGD-5977] Fix empty BT devices list after pairing

After changing flow of settings windows, the stopScan command
is being executed right after executing pairing, so cleaning the
scan devices list is being done on scan start

[EGD-5764] Implement handling multiple BT profiles

To be able to connect to the BT device with more than one audio
profile, we need something to manage those profiles. Created here
ProfileManager made it convenient
To be able to work properly with BT, CPU freq has to be at least
at Level_5 - to be fixed!

[EGD-2634] Add pairing process result confirmation

Enable pairing BT devices in settings.
Connect popup and add adjust messages for pairing error handling.

[EGD-5856] Update Btstack

Updated to the latest version, fixes few bugs

Merge branch 'EGD-5737-merge-master-to-exp-lbr-fix'