[EGD-8141] Fix brownout handling while charging

When the voltage dropped below the brownout threshold,
the system did not detect the battery charging
and displayed a window with the low battery icon all the time.

[EGD-8129] Add atexit functionality

Added atexit functionality. All global destructors and functions
registered with atexit() should be called at program exit.
It was possbile to reuse original newlib implementation with
MALLOC_PROVIDED flag set.

Made sure logger destructructor is called as last one.

Due to mudita OS legacy, it was not possible to simply fix dependencies
in global objectes and hence there are neither global objects
destructors nor functions registered with atexit() called when exit()
is called.
Possibly it will be changed later.

[EGD-8131] Add Reboot/Poweroff for _platform_exit()

Add support for Reboot and Power off for the
_platform_exit code.

Add _platform_exit mode handle

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>

[EGD-7860] Fix for call error flow

Make sure it is not possible to request a call twice.
Added new error windows for general call error and
no network connection.
Make sure there are no issues when call is requested
from external app e.g. from callog or phonebook.

Merge remote-tracking branch 'origin/stable'

[EGD-8079] CPU frequency conversion PWM fix

Fixed CPU frequency conversion.

[EGD-7922] Added Permanent Frequency Setting

Added Permanent Frequency setting in Advanced Developer
Mode with simple set window.

[BH-1277] Fix critical battery flow

Removed handling of critical battery level from bell's
home screen. From now on, battery SOC can drop to 1%
(battery notification will change from showing 1 bar to
crossed battery symbol upon reaching <5% SOC). If it drops
any further system shutdown procedure is invoked which results
in the device being turned off.

Merge remote-tracking branch 'origin/stable'

[BH-1274] Update fuel gauge

Update fuel gauge params

Merge remote-tracking branch 'origin/stable'

[EGD-7939] Fix wrong battery status after restarting the phone

Adding the necessary, short delay for synchronization
after configuration.

[EGD-7899] Keypad light settings fix

Fixed keypad light settings - removed always on option which had
serious impact on battery life time.

Merge remote-tracking branch 'origin/stable'

[BH-1169] Fix multiple issues with switches

Fix incorrect first latch switch
Fix missing first light click
Refactor switches code

Merge remote-tracking branch 'origin/stable'

[BH-1162] Battery SOC filtering

Added temporary fix for SOC calculation
during discharging.

Merge remote-tracking branch 'origin/stable'

[BH-1198] Fix critical battery level behavior

Fix of critcal battery behavior for Bell

Merge remote-tracking branch 'origin/stable'

# Conflicts:
#	products/BellHybrid/apps/application-bell-settings/models/TimeUnitsModel.cpp