[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-4918] Change network scan for operators

Change old implementation of network scan. Now in class
which have rest of network settings as NetworkSettings.
Change method from old message style to connect/API.

[EGD-4694] Add CPU frequency shift mechanism

The CPU frequency changes automatically which saves energy

[EGD-4856] Add Custom MMI message

Adds custom MMI respponse mesage.
It will be used by MMI response window to translate message.

Merge branch 'master' into stable

[EGD-4848] CUSD parser fixed (#1173)

Fixes CUSD parser bug, it was removig comma from USSD message.

[EGD-4522] USSD sesion handling (#1121)

Added USSD sesion handlig and small fixes on USSD.

Session handling was needed to show proper window on new incoming USSD code.

Co-authored-by: Kuba Kleczkowski <dd>

[EGD-4491] MMI call forwarding full support (#1069)

 * support for Basic Service Group and time
   parameter of call forwarding
 * fix RequestFactory, previously regex
   checking loop may have been left too early

[EGD-4413] New MMI codes support (#1051)

 * added support for CLIP, CLIR, COLP and call waiting
 * fixed service groups according to GSM technical data

[EGD-4403][EGD-4412] MMI support (#1021)

* cleaned up namespace and class naming in MMI framework
* extended MMI framework to support call forwarding and
  password change MMIs
* added support for requests that have different
  number of regex capture groups
* added MMI framework tests

[EGD-4063] Handling PUK/PIN (#1014)

[EGD-4063] Added handling of PIN/PUK codes for SIM card objects.
SimCard class was added (supply pin and puk, change sim, get state, get sim lock infromation, get attempts counters)
URCCpin via URC handler was added
New message type to send data handled in URCCpin handler to ServiceCellular

Egd 4097 call request recognition (#961)

* [EGD-4097] WiP Call request factory.

* [EGD-4097] Fabrication method changed.

* [EGD-4097] Call request handlers.

* [EGD-4097] Request handlers.

* [EGD-4097] Small refactor.

* [EGD-4097] Cleanup.

* [EGD-4097] Fixes aftr rebase + changelog.

* [EGD-4097] License fixed.

* [EGD-4097] PR suggestions.

* [EGD-4097] Fixxed request constructors.

* [EGD-4097] PR suggestions applied.

* [EGD-4097] Style fix.

* [EGD-4097] After rebase fix.

* [EGD-4097] Removed unnded semicolons.

Co-authored-by: Kuba Kleczkowski <dd>

[EGD-2408] Fetch sms at startup (#991)

[EGD-4116] +CME ERROR support for AT commands. Error number available … (#893)

[EGD-4116] +CME ERROR and +CMS ERROR support for AT commands. Now error code available in at::Result as errorCode via Variant type.

[EGD-2962] Refactor / improve URC handling (#947)

 - QIND URC has been extended to support FOTA reply
 - added support for CLIP, CMTI and POWERED DOWN URCs
 - added support for URC responses codes handling
 - created URCHandler abstraction and moved out URC handling from
   cellular service code
 - URC objects are now created by factory on a basis of URC head, rather
   than previous approach where they were created a priori
 - Renamed classes to be consistent with rest of the project

Egd 3676 (#824)

[EGD-3676] Version of PIN SIM handling with mockuped actions (messages)

Egd 4143 Service antenna enabled. (#936)

* [EGD-4143] WiP service-antenna enabled.

* [EGD-4143] Fixed service timer, connetion status from store.

* [EGD-4143] Changelog.

* [EGD-4143] Fixes after rebase.

* [EGD-4143] Service-antenna LOG disabled.

* [EGD-4143] PR suggestions.

* [EGD-4143] Duplicated includes removed.

Co-authored-by: Kuba Kleczkowski <dd>

[EGD-3839] Cellular - get time zone (#903)