[EGD-5390] Add keypad backlight to GUI

Added demo connection to keypad light
GUI window.

[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-2514] Fix clock does not refresh

There was no refresh trigger that would cause items like clock
to display its up-to-date state while user is being inactive.
This PR solves that issue providing timer-based refresh trigger
that is dependent on user activity.

[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-5519] Lockscreen does not ask for pin after reset solved

Name of parameter for lockscreen mode on/off updated in sql script.
Register on param lockscreen only reacts on value change.

[EGD-3434] ListView Scroll bar refactor

Added two new scroll bar types. Fixed for ListView
with equal height elements and PreRendered which
require whole list render - not recommended for big
lists but works with not equal heights elements.
Applied new types to all lists in Pure. Various
cleanups and refactors inside models and listView.

[EGD-5393] Wrong emergency number window

According to lately added emergency call window
there is need of window that handles invalid number
dial as emergency number.

[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-5073] Add UI modifications in Calendar after review

Changes mainly concern margins, positions, sizes etc of items in:
- Custom repeat window,
- New/Edit event window,
- No events window.

[EGD-5438] Fix returning from ice contacts window

Returning from ice contacts window goes back
to the contacts instead of previous used window.

[EGD-5387] Volte settings change problem solved

Volte settings made global. Merge issue regarding screen lock resolved

[EGD-4889] Fix add/edit contact from dial window

Original behaviour (from dial window) was that user-provided number
was send to db with partial match query. This could cause more than
one result, with no further selection rule. Solution to this
particular behavior was to switch to full number match query.

Additionally problem with unrecognizable prefixes in user-provided
numbers was solved.

[EGD-5043] Add emergency call window

According to PurePhone design emergency call
window is needed after "SOS" callback at the screen lock.
This PR introduce implementation of emergency call window
and also refactor in the enter number window. Both windows
derives from new number window.

[EGD-4708] Add backend of multiday events handling

-sql req for multiday events handling
-Add UT
-Add markEventsInDays method
-Add new query for day filter

[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

[EGD-5090] Add Brownout GUI window

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

Merge branch 'master' into stable

[EGD-5325] Remove using namespace directives from headers

"Using namespace" directive should not be added in headers
because this practice pollutes source files.

[EGD-5215] Add APNs list

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