[BH-1787] Reboot to MSC endpoint

To allow the automation of gathering logs and swapping out OS images during tests a MSC reboot
endpoint was added. Together with a change to ecoboot, this allows the sending of a "reboot to
MSC" command. The deivce will then reboot and enter MSC mode.

[BH-1791] Add CPU frequency lock during log dump

This will improve security and peripheral stabilization when downloading
logs to a file.

[BH-1801] Fix incorrect calculation of requested CPU frequency

Sometimes when the frequency is locked, e.g. at 132 MHz, the algorithm
still calculated a lower frequency, e.g. 66 MHz.

[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

[BH-1774] Fix frequency lock during user activity

- Sentinel locks the frequency when pressing buttons and the encoder.
- The "user activity" sentinel will be properly managed by the system
(CpuGovernor) just like other sentinels.
- Adding information about active sentinels in the power management
statistics logs

[MOS-1011] Fix frequency switching stability

Multiple fixes of clock switching related
stability issues:
* added RC oscillator hysteresis as in NXP example;
* changed DCDC converter config;
* configure PLL2 to be able to run on any CPU
frequency level;
* added switching to 1.275V (overdrive) voltage
when applying any clock change above 12MHz as
well as LDO or bandgap switching, as done in
Mbed OS' lpm.c for RT1050;
* changed BMCR AXI queues weighs for SDRAM
in JLink scripts to disable operations
reordering, as it is known to cause data
integrity issues;
* extracted some code to separate files;
* smaller or bigger code cleanups.

[BH-1412] Whitelist update

Whitelist removed for Harmony
Changed the way whitelist is obtained
Added missing logs for Eink Dispaly

[BH-1412] Fix system shutdown procedure

Changed startup services order.
Prevent handling multiple "close ready" messages from one service while closing
system.
Introduced a new state in ServiceGUI.
Fixed a problem with turning on Harmony with a connected USB cable.

[BH-1412] Fix services dependencies

Changes in dependecy managment
Replacing state flags with states in ServiceGUI
Unifying some parts of code

[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

[MOS-903] Remove reboot to USB MSC mode

Remove mechanics enabling to perform reboot
to MSC mode by sending request to one of the
endpoints via serial port, as it is not
implemented in bootloader and may potentially
be unsafe.

[MOS-237] Removed unnecessary workaround for system reboot

Removed workaround for rebooting into recovery (update)

[MOS-851] Remove factory reset screen from backup and restore

Fix of the issue that factory reset screen
informing user of need to manually turn
on the phone to continue the process
was appearing also when restarting to
backup or restore.

[MOS-786] A/B Booting - fixed factory reset from menu

Now factory reset works both from ecoboot and from menu

[MOS-786] Added support for A/B boot codes in OS

Further implementation of A/B booting

[CP-1424] Refactor backup and restore endpoints

Redesign of backup and restore endpoints in the
service-desktop to delegate responsibility for
execution of the actual backup and restore process
onto the Updater.

[MOS-275] Fix alarm rings on the low battery screen

When we had a critical battery level and the alarm clock rang,
it was impossible to turn it off.

[MOS-788] Fix incorrect total CPU usage in logs

After a long time, a counter overflow appeared

[MOS-775] Create run-time statistics for tasks

Every hour, statistics of tasks that put a heavy load
on the CPU will be logged

[MOS-424] Improvement of logger module

Due to losing bytes the logger has a worker
which is responsible for dumping logs to
the file. The logger also has its own timer
to dump logs every 15 minutes. EventManager
is not responsible for interval dumping logs
now.