[EGD-2931] Fix private number incoming calls

The change adjusts both cellular service as well as
call and call log applications to handle properly
incoming calls from private numbers.

[EGD-5319] Add test related to cold and hot start of cellular

Add harness test related to cold and hot start of cellular service

[EGD-5295] Fixes in Calllog app

Fixed some Calllog UI issues:
Fixed lack of calllog entry after call aborting

[EGD-5529] Added CLCC parser

New cmd mechanism implementation of CLCC parser.
Unit tests implementation for the parser.
Refactor of searching for active outgoing call
in service cellular.

[EGD-5599] Change AT and DLC channels for big return

Change which allow to handle large return from
at commands both via UART and DLC-Commands

[EGD-5677] Tune echo cancellation parameters

Tuned parameters according to Quectel guide

[EGD-4386] Add VoLTE on/off functionality

Modem setup so that VoLTE connection is possible,
as long as there is LTE coverage
and the operator allows it.

[EGD-5594] Fix sending multiple cmux frames

Sending multiple cmux frames was broken. Sending at command
longer than 127 bytes caused the modem to freeze.

[EGD-5299] PR comments

Deleted commented-out digital filter calls. Moved QEEC to factory.
Added selection for echo cancellation strength.

[EGD-4990] Add UT for at+ccfc parser

It adds Unit tests for at+ccfc command parser.

[EGD-5158] Change access to the bus methods

The bus is now accessible only via Service object.

[EGD-5045] Change call flow handling for lock screen

Call requests on lock screen have to be handled
separately to allow only emergency and ICE numbers.

[EGD-5298] Microphone Adjust

Changed parameters for mic GSM path to get clear voice

[EGD-5451] Added SMS Center SMSC check to OS

Extended cmd mechanism to provide class defined responses and
implemented SMS center verification to check if SIM card is properly
cofigured and is able to send SMS messagess at all.
This check is needed because if SMS Center is lost we are not able
to send SMS messages with no verbose error codes.
Added milliseconds and noexcept specifiers for at commands
Fixed Chanel name to Channel

[EGD-5451] Removed unused and potentially harmful cmux api

We do not and should not use api removed. We should use Chanel and
Response in cellular code.

[EGD-4861] Call waiting response parser

It allows to show proper GUI windows for call waiting MMI responses.

[EGD-4831] Add license headers to c, h and sql files

Add license headers to `h`, `c` and `sql` files as this files haven't
been checked previously, script now to automatically updates current
year in existing licenses.

[EGD-4862] Add CLIP, CLIR etc responses parser

It allows to show proper GUI windows for CLIP,
 CLIR and IMEI MMI response

[EGD-4860] Add call barring response parser

It allows to show proper GUI windows for call barring MMI responses.

[EGD-4859] Add call forwarding parser

It allows to show proper GUI windows for call forwarding MMI responses.