[EGD-5527] Fix APN GUI functions: add/edit/delete

redefine functions: saveAPN, renameAPN
add activeApn field to hold selected APN
refresh Apn list after add/edit/delete

[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] Cleaned i18n header from vfs

internationalization is included nearly everywhere in system it
should not be polluted with include which is to be removed

[EGD-5315] Add ambient light gauge to DisplayLightWindow

Temprary solution to make an experiment.
Ambient light level displayed each 2 seconds in order
to measure lighting curve.

[EGD-5387] Volte settings change problem solved

Volte settings made global. Merge issue regarding screen lock resolved

[EGD-5287] Add Languages window

- add LanguagesWindow,
- add GetCurrentDisplayLanguageRequest message used for
  sending request from LanguagesModel,
- add GetCurrentDisplayLanguageResponse message sent by
  ApplicationManager and handled by ApplicationSettingsNew,
- add setFocusOnElement method in ListView so current
  display language can be focused on when entering
  LanguagesWindow

Merge branch 'master' into stable

[EGD-5215] Add APNs list

Load APNs from service cellular.
Add ApnSettings model.
Connect ApnOptionWindow with ApnSettingsWindow.

[EGD-4960] registerVariableChange moved to Init section of apps

[EGD-5347] Save/load brightness mode

Properly display mode as OnOff switch on screen.

[EGD-4801] Add application-wide top bar manager

Applications configure the top bar once for all their windows.
Sometimes, windows need to configure top bars with its configuration.

[EGD-5338] Add APN options window - gui

This is just GUI, window is not connected yet.
It will facilitate further development of APN settings,
and will be enhanced later.

[EGD-4995] Fix changing passcode windows

Some implementation of
"EGD-4995 Add changing passcode windows flow"
was removed from master by PR:
"EGD-4743 Add new/options windows to quotes".
This PR restores this implementation.

[EGD-4740] Add New/Edit APN window - Part1

Add New/Edit APN window - basic window/ model/ widget

[EGD-5288] Add Main system window

In settings add “System” window with all main menu items
(items are just menu positions not connected to actual windows)

[EDG-4743] Add new/options windows to quotes

Add windows for add/edit/delete quotes, use ListView for quote display.

[EDG-4743] Add new/options windows to quotes

Add windows for add/edit/delete quotes, use ListView for quote display.

[EDG-4717] Add screen for brightness control

Window for manual and automatic screen brightness control.

Merge branch 'master' into stable

[EGD-4995] Add changing passcode windows flow

Implement changing passcode windows flow