[EGD-6121] Add offline mode in service cellular

Adds entering and leaving ito offline mode in sevice
cellular. Outgoin SMS and calls are blocked Proper popups
are shown in applications Call and Messages.

[EGD-6351] Add Factory reset window

Add Factory reset window to Settings

[EGD-6259] Turn off usb security

To prevent errors with USB connectivity and charging screens.

[EGD-6298] Fix Calendar crash on allDatEvent focused

NewEventCheckBoxWithLabel experienced crashes on focusChangedCallback.

[EGD-6283] Fix to slow Application Desktop start

ApplicationDesktop start was slowed down by two synchronous DB calls:
-get unread threads count
-get unread calls count
Both were replaced with asynch versions.

[EGD-6268] Add SAR info window

Window contains detailed information about SAR and certification.

[EGD-6267] Create Technical Information Window

Add Technical Information Window to display tech info on Pure.

[EGD-6266] Create Certification Window

Add Certification Window to display certification information.

[EGD-6262] Refactor Quotes

- Connect QuotesMainWindow to work with agent,
- Use DatabaseModel in Quotes and Categories models,
- Connect add/edit/remove quotes with agent

[EGD-6304] Popup overall fixes

Removed duplicated mode observer from application
that was introduced during the rebase in this commit
1860bf210f5f128ee8cf780c0cb332abc918dbd1.
Fixed mute logic according to the design.
Fixed switching back to the meditation window.

[EGD-6314] Phone mode widget visibility

Phone mode widget will be visible only on main screen, while entering
numbers or in emergency call mode. Also it will be disabled whenever NAT
widget is enabled.

[EGD-6280] Further changes to Pure menu wording

Fixed 'Advanced' title.

[EGD-6263] Add  automatic linear brightness

Linear automatic backlight controller - part1

[EGD-5744] Phone mode status bar widget

Added phone mode widget to top bar. The widget is mutually exclusive
with NAT widget. Phone mode is determined using phone mode observer.

[EGD-6264] About Your Pure Main Window

Add window About Your Pure to help display Technical Information,
Certification and SAR.

[EGD-5743] Added phone modes popup

Implementation of phone modes window.
Minor fixes of previous approach.

[EGD-6193] Connect Categories window with agent

Connect Categories window with agent

[EGD-6222] Fix the App Calendar memory leaks

This PR fixes:
 -several explicit uses of `new` that were not matched by `delete`
 -dangling `CalendarTimeItem`s
 -reset of focus on the `allDayEventCheckBox` check/uncheck
 -exiting the app form `allEventsWindow` on `KEY_RF`

[EGD-5712] Volume popup added

There is need of popup window on volume key
pressed event. This PR handles:
Creating base popup window attached to
application desktop.
Creating volume window.
Audio key events logic implementation.

[EGD-6111] Timers refactored

Deep refactor of system timers.