[CP-1852] Too many user files removes default relaxation audio from the list

Changed order in which files in Relaxation are displayed
Added error message when files limit is exceeded

[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-1825][BH-1660] Update while on onboarding screen

Commit DB changes

[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

[BH-1650][BH-1651] Fix the frontlight settings

Run the frontlight settings in "on demand" mode now
turn on the backlight with the proper intensity.
If the device is idle in the frontlight settings the backlight
isn't turn on after backing to the main window.

[CP-1842] Extremely long title tag causes delay when loading Relaxation songs list

Fixed by limiting the maximum text length in relaxation main window

[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.

[CP-1837] Random crashes while copying files

General improvements to prevent running out of memory while copying
files via Mudita Center

[BH-1656] Use fixed gt pressura 46 light

With generated % character that was missing

[BH-1655] Fix memory leaks in clock faces and shortcuts

Disable libphonenumber initialization since it is not used in Harmony
but takes around 1.4MB of memory

Add heap allocation statistics

[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.

[BH-000] Modify ecoboot version to 2.0.0

.

[CP-1848] Problems with displaying file names

Added missing characters to font 'gt_pressura_light_46' used in Relaxation

[BH-1646] Center empty batter icon vertically on shutdown window

Set icon text visibility to false.

[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

[BH-1639] Add welcome message with charging info

Add new bell welcome window
Add new close reasons
Add new actions
Bump assets version
Remove bold text from welcome message
Remove bold text from onboarding popups

[CP-1825] Update while on onboarding screen

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