[MOS-686] Fixed MTP availability only after phone unlocked

Fixed file access via MTP even when phone is not unlocked.
Now access is granted when the phone is unlocked by the user entering
a passcode. If the phone is not passcode protected (passcode is nor set)
then access to the files is always possible via MTP.

[MOS-636] Added MMI/USSD confirmation

USSD/MMI codes are now confirmed after they are sended.

[MOS-000] Fixed minor issue in db migration script

* Removed doubled copyright header from 'up/down/devel.sql' when committing
databases.
* During installing, 'devel.sql' was created even if specific revisions
didn't contain one.
* Removed unnecessary product-specific .lua scripts.

[CP-1837] Random crashes while copying files

Use ConstMemoryConstrainedFileRef newly added to taglib

[CP-1797] Low battery connection with mc is possible

Decrease critical battery level from 10% to 5%
Add a new entry to the security endpoint in order to block MC
when the phone battery level is critical

[CP-702] Add API for managing templates order

This API allows for managing message templates order.
DB Migration: adding a new column to templates tables.

[BH-1630] Turn off the device for low voltage

The system closes only if the SoC is 0%, but
it doesn't react if the voltage has low level.
The new implementation invokes the close
procedure if the voltage is less than 3.4V.
This solution should avoid possiblity to
hang the MCU.

[MOS-943] Remove old factory reset mechanism

Removed old factory reset mechanism that is
no longer needed after UDM.
Fixed accessing previously moved variable.
Minor cleanups.

[MOS-939] Apply target update scripts

* Removed old UDM-related update scripts that are no longer needed.
* Applied target update script
* Removed unneeded data folder from user partition
* Removed dummy personalization.json

[CP-1825] Update while on onboarding screen

Add a parameter to device info about onboarding state.
Update documentation for Pure and Harmony.

[MOS-921] Fixed unexitable screen while having a missed call during template selection

Created a cloned SMS template window to differenciate it from the
templates used in SMS thred - better than creating a bool flag...

Added switchBack on missed call to application messages

[MOS-922] Add database migration docs

* Added database migration docs
* Updated database migration tool

[MOS-202] Add meditation parameters to non-volatile memory

The meditation parameters set by the user will be remembered.

style check fix

[MOS-905] Fix crash on power off with USB cable connected

Fix of the issue that turning off the phone and
clicking any keyboard button resulted in
crash and reboot.

[MOS-59] Change tethering text to icon in status bar

Changed text to icon, fixed behaviour with phone modes

[MOS-237] Removed unnecessary workaround for system reboot

Removed workaround for rebooting into recovery (update)

[CP-1624] Adding numberID as a field to contact and message response

Changing the way Center is recognizing the threads in the message
window by introducing the numberID

[CP-1419] Signal range in Pure status without SIM card inserted

Fix for incorrect signal strength displayed in Center when network
status is NotRegistered.

[MOS-776] Deletion of outdated and invalid SettingsApi test

Deletion of outdated and invalid SettingsApi test. New test are planed.

[MOS-000] Rebase fixes

Rebase fixes