[EGD-4734] Add PIN settings window

This window displays switch button for
disabling/enabling pin code for sim card.
Its also starting point for changing pin code.
Added actions for enabling and disabling
pin code for sim card.
Added method for checking if pin code is
set for sim card.

[EGD-6422] Add cellular phone mode documentation

Add breif documentation of handling phone modes
is service cellular.

[EGD-5748] Revert remake cellular flow

Reverts changes due to reported issues

[EGD-6322] Add rejecting incoming calls in dnd mode

Adds rejecting incoming calls in Do not disturb mode.

[EGD-6121] Add offline mode in service cellular

Adds entering and leaving ito offline mode in sevice
cellular. Outgoin SMS and calls are blocked Proper popups
are shown in applications Call and Messages.

[EGD-6376] Fix for no response on SIM pin confirm

CellularSimPinDataMessage wasn't handled by ServiceCellular
which caused that GUI didn't receive any response and stuck in
last known state.

[EGD-5748] Remake Cellular flow

This commit changes TS0710 Worker operation.
1. It introduces MessageBuffers as main
interprocess data passing mechanism.
2. DMA transaction status codes and CMUX errors
are now propagated to Service.
3. Data processing has been refactored.

[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-6331] Add cellular low power documentation

The documentation describes how to get into
and out of sleep mode for Cellular.

[EGD-6101] Add low battery start prevention

Device will be shutdown after
startup if SOC will be below
shutdown level

[EGD-4863] Add harness test for cellular sleep mode

Adding test for outgoing call and text message
in cellular sleep mode

[EGD-4852] Add sleep mode for GSM modem

When the GSM modem is idle and there is no communication,
it enters the sleep mode, where the power consumption
is significantly reduced.

[EGD-6455] Fix modem AT command timeouts

Fix modem AT command timeouts and make sure they are at least
bigger than the ones defined in Quectel specs.

[EGD-6455] Fix for incomming text messages issue

There was no proper error handling.
Minor routine refactor

[EGD-6079] Moved at factory from header to cpp file

- data moved to std::initializer_list no issue warned with tools
- GCC tools do not warn issues with memory now

[EGD-6111] Timers refactored

Deep refactor of system timers.

[EGD-4851] Add URC support in sleep mode

When URCs come from the network and GSM is in sleep mode,
we wake up the modem to properly handle the incoming data.

[EGD-5919] Fix: Fix logs from Service: Cellular, Fota

Fix: Remove misleading error message(change to debug/info).
Do not trace as error multiple retry. Minimize (to zero)
error logs on cold and hot start of the phone.

[EGD-5902] Phone Modes Windows

Windows for phone modes created.
Offline:FightMode/messages only ServiceCellularApi created.
ConnectionFrequency and DND options settings throught AppSettings.

[EGD-6114] Fix bad end of line in Service cellular

CRLF end of line fixed to Unix one