[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-5090] Add Brownout GUI window

Gui window will appear due to brownout
event. System shutdown will be also called.

[EGD-4960] Settings Interface added parameter do distinguish global/app settings
[EGD-4960] global/local setting determined by enum value, unregister all variables in one call, ut updated
[EGD-4960] SettingsScope usage in SettingsMessages

[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.

Merge branch 'master' into stable

[EGD-2501] Add gsm powerdown due to battery

Gsm model power state maintenance based on battery level.

[EGD-4338] Fix menu notification dot

Each tile in Menu that uses notification dot
is be refreshed. It also solves missing dot
issue of EGD-4129 and lack of sound notification
on incoming text message.

[EGD-5166] Add query-callback synchronization mechanism

Receiver object cancels the callbacks at the end of its lifecycle.

Merge branch 'master' into stable

[EGD-4464] Provide GUI for MMI internal messages (#1139)

Merge branch 'master' into stable

[EGD-4465] Create info window for incoming MMI messages (#1078)

[EGD-4466] Create USSD communication window (#1117)

[EGD-3572] SettingsTable exchanged to settings::Settings (#968) (#1044)

[EGD-3572] Application has an instance of Settings - removed from derived apps
[EGD-3572] Application is the owner of Settings handling for its windows/widgets
[EGD-3572] Settings header moved to service-db public section

[EGD-4452] unify desktop locks (#1071)

* [EGD-4452] Desktop locks refactored

[EGD-4153] Use actions instead explicit applications switch. (#1032)

[EGD-4475] ScreenlockCheckEvent handler bug fix (#1062)

[EGD-4367] sim passcodes flow implementation (#1033)

Revert "[EGD-3572] SettingsTable exchanged to Settings::Settings (#968)" (#1035)

This reverts commit f11bc1f0d0120c04ee6f826f75c9e8a9f5894602.

Co-authored-by: Hubert Chrzaniuk <hubert.chrzaniuk@mudita.com>