[EGD-4625] Fix update timeout timer

Moved timer handling to Service Desktop
Use message comm. to update timer state

[EGD-4797] Battery bar as widget

Battery bar now is present as
a separate widget in top bar.
Additionally refactored passing
battery status.

[EGD-5382] Add LowPower CpuSentinels

In order to synchronize the Low Power mode, the services were
immediately informed about the frequency change,
so that they can update their resources (e.g. PWM filling)
and services may request the maximum CPU frequency in order
to perform a task (e.g. screen redraw, telephone conversation)

[EGD-5381] Add Low Power Drivers

Peripherals clock synchronization dependent on PLL2

[EGD-5390] Add keypad backlight to GUI

Added demo connection to keypad light
GUI window.

Merge branch 'master' into stable

[EDG-4717] Add screen for brightness control

Window for manual and automatic screen brightness control.

Merge commit 'c7dd6b399' into stable

Merge branch 'master' into stable

[EGD-2501] Add gsm powerdown due to battery

Gsm model power state maintenance based on battery level.

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

Add VoLTE ON/OFF switch in Settings Network window

[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-5050] Add brownout detection

Brownout detectection realized through charger driver

[EGD-4978] Add Bluetooth virtual audio device

Bluetooth audio device requires different handling than other
audio devices. The commit adds proxy device that does not
handle requests itself but instead sends requests too Bluetooth
service.

[EGD-4952] Added critical level check + messages

Merge branch 'master' into stable

[EGD 4654] spike light sensor to display (#1158)

* [EGD-4654] Light control first working

* [EGD-4654] Extended interface with custom brightness function

* [EGD-4654] Extended set of actions

* [EGD-4654] Fixed timer issue + cleanup

* [EGD-4654] Improving switch-case logic

* [EGD-4654] Moved keypad light control to previous state

* [EGD-4654] Refactor in screen light message

* [EGD-4654] Documentation work

* [EGD-4654] Extension of docu

* [EGD-4654] Typo fixing

* [EGD-4654] More improvements in doc

* [EGD-4654] Doxy generation fixes

* [EGD-4654] Pre pr cleanup

* [EGD-4654] PR comments pt 1

* [EGD-4654] Docu small change

* [EGD-4654] Doc updated with pumls

* [EGD-4654] added newlines at the end

Co-authored-by: Wojtek Rzepecki <wojtek.rzepecki@mudita.com>

Merge branch 'master' into stable

[EGD-4653] BSP: amblient light sensor (#1135)

* [EGD-4653] Added first working readout

* [EGD-4653] Light sensor first working irq

* [EGD-4653] Interrupt config

* [EGD-4653] Cleanup

* [EGD-4653] Linux target file added

* [EGD-4653] Added messages with readout + fix of keypad light message

* [EGD-4653] Proper lux calculation

* [EGD-4653] Branch fix

* [EGD-4653] Pre PR cleanup

* [EGD-4653] Clang tidy hints application

* [EGD-4653] PR comments pt1

* [EGD-4653] Style branch fix

* [EGD-4653] Pr comments pt2

Co-authored-by: Wojtek Rzepecki <wojtek.rzepecki@mudita.com>

Merge branch 'master' into stable