[EGD-4429] Fix gui issues in application call

Fix the persistent answer and reject labels in Call Window issue
Fix the wrong call duration issue in both Call and Calls apps
Fix the not working call ignoring issue

Merge branch 'master' into stable

[EGD-2501] Add gsm powerdown due to battery

Gsm model power state maintenance based on battery level.

[EGD-4338] Fix menu notification dot

Each tile in Menu that uses notification dot
is be refreshed. It also solves missing dot
issue of EGD-4129 and lack of sound notification
on incoming text message.

[EGD-4836] Add firmware update test

Add test utility to update firmware via USB (service-desktop API)
Add timeout to harness port discovery

[EGD-5240] Add common timeout to python test harness
General purpose timeout based on signals library

[EGD-5239] Preserve 1Phone testing
In the long run test harness requires two phones,
but allow for one phone to still pass some test cases

[EGD-4580] Add BT settings middleware

Added bluetooth settings middleware to store BT status in settings.
Added middleware layer to handle new settings queries.

[EGD-5034] Change gain values to reduce echo during call

Default values of the gain for the build-in and headphones
microphone has been changed. Previously set excessive values
caused echo during call.

Signed-off-by: Lukasz Skrzypczak <lukasz.skrzypczak@mudita.com>

[EGD-4711] Change calendar events endpoints

-Create providers object
-Change endpoints data message structure to json object
-Extend ical format validation
-Extend service desktop tests for calendar endpoints

[EGD-4835] Fix HIL Readme, code, so it works, rename, random GCC 10 fix

Polish README, so it works 1:1.
Rename method, so it blends better with its calls.
Delete old code, leave phone unlock.
Try not to see this random GCC 10 fix here.

[EGD-5166] Add query-callback synchronization mechanism

Receiver object cancels the callbacks at the end of its lifecycle.

[EGD-4968] Add Service GUI documentation

GUI service documentation added.

[EGD-4317] Fix newly added contact recognized as a duplicate

of temporary contact. Newly added contact is no longer considered
as a duplicate of a temporary one.
It simply replaces the temporary contact, if its number matches.

[EGD-4737] Add VoLTE ON/OFF switch in Settings Network window

Add VoLTE ON/OFF switch in Settings Network window

[EGD-4920] Add API to get current operator name

Asynchronous API to get operator name,
also possibility to easy extend solution for
current operator technology and information about
operator selection mode (automatic/hand).

[EGD-4919] Add API functionality to set operator

Functionality for set operator (with name) and
set autoselect were added.

[EGD-4628] Add APN settings and URC handler for PDP context

Classes supporting APN settings on modem and telephone
configuration (synchronization) have been constructed.
Possibility of asynchronous execution
of individual actions via ServiceCellularAPI.
Added message with information about deactivation of the
PDP context (URC) that the
application / service can listen on.

[EGD-5133] Fix settings bus add duplications

Changed Bus Channels vector to set to prevent
duplicates and cleaned logging.

[EGD-4968] Change GUI service to optimize flow and memory management

Gui and Eink services refactor.
Displaying frames performance optimization.
Critical resources management.

[EGD-5026] Change Eink service code structure

Refactor.

[EGD-5050] Add brownout detection

Brownout detectection realized through charger driver