[BH-1809][BH-1835] Add date format setting

Added date format selection between DD/MM and MM/DD.
The time setting has been updated.

[BH-1782] Add brightness fade in

* Added brightness fade in - feature
which allows for gradual frontlight
brightness rise during alarm and
power nap ringing instead of turning
on with full brightness immediately.
* Fixed possibility to close
ringing power nap by long press
of back button.

[MOS-1056] Hide the SOS label when the modem is not ready during onboarding

Hide the SOS label during onboarding when the modem is not ready for an emergency call.

[MOS-220] Changed signal strength refresh mechanism

Modified signal strength update mechanism
to avoid unnecessary screen refreshes in
case new signal strength value is equal
to the previous one.
Minor cleanups.

[MOS-1052] Change VoLTE label from 'beta' to 'experimental'

Changed VoLTE label from 'beta' to
'experimental'.
Fixed transition state label font
size to match the design.

[BH-1696] Notification when connect the device to the charger

Adding notifications when charger is connected

[BH-1688] Create a standard for logs

* Adding document describing how to use logger
* Adjusting logs to follow a new guide
* Change order in log header:
  line number is now before function name

[MOS-1048] Fix not fitting VoLTE button label

Fix of the issue that VoLTE checking
state label was cut off due to
improper setMinimumWidthToFitText()
method behavior when text is placed
in box with rounded corners.

[MOS-669] Add too hot battery notification when charging

* Added notification showing on the main
screen if the battery has reached too
high temperature to continue charging.
* Code cleanups.

[MOS-948] Fix for tethering popup was losing user unsaved data

Fixed data loss when creating or editing a note/contact after connecting
the USB cable and selecting the option to enable tetering in the popup window
that appears. Now, when the user wants to enable tethering, they will be asked
if they want to exit without saving.

[MOS-552] Fix alarm clock input behavior

Fix of multiple issues that manifested in
input fields of alarm clock, i.e. value
not erasing automatically, redundant
double-zero filling of hours field,
lack of zero-filling of minutes field
when navigating to AM/PM field in
12h mode.

[MOS-1031] Fix Meditation app screen lock

Fix of the issue that Meditation app
would prevent phone from locking on
every screen, though it should do
so only on timer screen.

[MOS-948] Revert: Fix for tethering popup was losing app context

Reverting previous fix because when tethering is switched on the user
are not able to use phone features, and we this fix make the user
to pass this block and it would make their confuse.

[MOS-1027] Fix lack of tethering icon on 'Tethering is on' popup

Fix of the issue that pressing menu button while
in tethering resulted in LTE and no signal icons
appear on status bar instead of tethering icon.

[MOS-1021] Fix blocked passcode behavior

Fix of the issue that after blocking
passcode from Center, Pure would still
display passcode input popup; providing
valid passcode there would result in
phone entering invalid state, where it
behaved as if it was unlocked, but
with blocked passcode.

[MOS-1026] Add extended logging to Pure's charger driver

* Added extended logging to Pure's charger driver.
* Removed redundant handling of INOKB pin
interrupt - charger is configured to provide
the same interrupt via INTB pin.
* Minor code cleanup.

[MOS-1024] Fix unlocking phone after locked with tethering popup

Fix of the issue that after phone has locked
on tethering confirmation popup, unplugging
USB cable would result in bypassing phone
lock screen without providing password.
Minor ApplicationCommon cleanup.

[MOS-948] Fix for tethering popup was losing app context

Fixed data loss when creating or editing a note/contact after connecting
the USB cable and selecting the option to enable tetering in the popup window
that appears. Now when tethering is enabled via the popup, the user will
return to Application without data loss.

[BH-1745] Fix a deep press crash during popups

Rewrite the popups filter to remove unnecessary popups.
Remove callbacks from activate and deactivate popups
which cause problems when the popups was on the stack.

[MOS-1002] Change USSD code handling to match design

Fixed issues with GUI behaviour on failed
USSD code handling.
Minor code cleanup in several parts of system.