[EGD-5204] Secure USB communication

Secure all endpoints by returning 403(Forbidden) when USB is connected.
Request screen passcode to enable secured endpoints.

[EGD-5863] Add retry dialog window

Add generic retry dialog window

[EGD-5737] Merge master into experimental

Synchronize with master before merging

[EGD-5312] Add Time selection window

- add ChangeDateAndTimeWindow,
- extract EventTimeItem to common widgets folder
  and rename it to TimeWidget,
- extract EventDateItem to common widgets folder
  and rename it to DateWidget,
- replace timeWidget with common TimeWidget
  in NightshiftWindow,
- refactor time setting in
  DesktopMainWindow and TopBar,
- Remove dead code from EventManager
  (GetNextAlarmTimestamp and HandleAlarmTrigger)

[EGD-4339] Refactor AllDevices and PhoneName windows

Rewrote these windows in a proper way.
Fixed few minor issues.
GUI adjustments.

[EGD-4340] Refactor bluetooth settings and add device windows

Rewrote these windows in a proper way.
Fixed few minor issues.
GUI adjustments.

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5707] Add empty Time Zone selection window

Add Empty window for time zone selection. Connection with DB
will be don in separate PR.

[EGD-5158] Change access to the bus methods

The bus is now accessible only via Service object.

[EGD-5472] Bluetooth worker state machine

State machine POC implemented using SML library.

[EGD-5311] Create Date&Time main window

- add DateAndTimeSettings class and
  dateAndTimeSettings global var
  (cache for storing date and time related settings),
- add DateAndTimeChangeRequest messages and proper
  methods in app::manager::Controller for sending them,
- handle DateAndTimeChangeRequest messages in ApplicationManager,
- add SettingRightItem::Text case for OptionSettings
  to provide possibility to add text
  on the right side of particular option,
- rename fields in db (settings_tab table):
  gs_time_format_12 to gs_time_format
  and
  gs_time_date_format to gs_date_format
- create only main Date&Time window.
  Sub windows will be added in separate task.

[EGD-5390] Add keypad backlight to GUI

Added demo connection to keypad light
GUI window.

[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.