[EGD-6682] Fix BT name change bug

To update the BT name there is a need to restart the BT stack.
Sending proper command during working stack wasn't working

[EGD-6626] Fix displaying bluetooth phone name in app settings

Reading bluetooth phone name was not implemented
on service bluetooth side.

[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-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-6066] Removed Message default constructor

Forced each message to have declared type as parts of Bus logic
depends on it and previously we encountered undefined
behaviours. Added tests and messages validators.

[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-6052] Add idle BT device disconnect

After 30 minutes of inactivity (no stream) the device
is disconnected

[EGD-6168] Lock CPU frequency only while BT is working

Due to fixed BT transmission, the CPU frequency can be lower.
To be more power-friendly, minimal working freq is being set while
working with Bluetooth

[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-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-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-5304] Add new way of system close

Unified method of closing
the system orchestrated by
system manager

[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-5861] Complete bluetooth connecting process on settings side

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

[EGD-5879] Fix BT uart error

To be able to properly send data via UART, the frequency has to
be higher (to be fixed in the future)

[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-5737] Merge master into experimental

Synchronize with master before merging