[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-2501] Add gsm powerdown due to battery

Gsm model power state maintenance based on battery level.

[EGD-4925] Change new filesystem handling implementation in module-gui. (#1193)

Due to vfs deprecation there is need to remove all vfs calls from code. This PR covers module gui. There are some modifications in other modules included which are necessary because of build system issues.

Merge branch 'master' into stable

[EGD-4455] Desktop windows refactored (#1095)

[EGD-4150] Change filename i18 to i18n (#1108)

Change filename of internationalization files from i18 to i18n.

I18n should stand for internationalization, not i18. That's why I changed in 'module-utils' name of the folder 'i18' and both .cpp and .hpp files to 'i18n'.

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

* [EGD-4452] Desktop locks refactored

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

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

[EGD-4221] Convert service-time to library

[EGD-4369] Absent call button on desktop with notifications fix (#1002)

EDG-3585 Small fixup for refresh & cleanup in buildDrawLists (#916)

* EGD-3585 Minor refresh fixup&  Normalised buildDrawList everywhere

DesktopMainWindow notifications update (#886)

[EGD-4051] Based application manager app switching on application stack. (#858)

* [EGD-4051] Based application manager app switching on application stack.

* [EGD-4051] Application manager thorough refactor.

[EGD-3743] Removed old doxygen copyright statements from project.

[EGD-3743] Update copyrights in fies

[EGD-3315]Review: minor changes

[EGD-3315]Review changes (minor)

[EGD-3315] Main functionality: DB queries, timers processing, base classes for future use

[EGD-3597] Shape rendering refactored. (#827)