[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-000] Update changelog

Create section for 2.1.0 version in the changelog

[BH-1761] Add a log when manual reset is performed

If the user performs a manual reset there is no information in
the logs. It can be treated as software resets.
So the best solution is to add a log about incoming
manual reset and dump all logs to the file.

[BH-1753][BH-1754] Bump Ecoboot version for Harmony

Bumped Ecoboot version for Harmony from 2.0.2 to 2.0.4.

[BH-1758] Fix information about next alarm ring

Launching an application requires an updated
alarm time from the database.

[BH-1756] Fix "turn off" window display time

"Turn off" window should be displayed for 10 seconds triggered by
pressing the buttons "light" and "back" or 180 seconds triggered from
the menu->settings

[CP-2032] Unplugging the cable during file upload leaves partially sent file

Files not completely sent will be deleted after the USB cable is removed from
device to not leave any partially sent file

[BH-1750] Fix meditation countdown timer

When the meditation countdown timer is enabled
and the deep press is performed before this window expired
then it displays 0:00 timer.

[BH-1757] Fix Hard Fault handling

Added a critical section when handling Hard Faults
co-author @Lefucjusz

[CP-2130] Never ending files upload

Corrected check to see if a device has enough free space to upload a file.

[BH-1746] Minor fixes for onboarding

- default year update
- added system shutdown if there is no user activity for 180 seconds on
the language selection screen
- fixing the logic in onboarding screens

[BH-1748] Fix problem with sounds in applications

The deep press can disable alarms which cause
disable sounds. That behavior interrupts sounds in
applications.

[BH-1749] Fix diacritics in translations

Some texts did not have diacritics in the translations

[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.

[BH-1241] Fix the frontlight in pre-wake up

Disable the frontlight and chime when the
pre-wake up is off using deep press.

[BH-1728] Fix redundant clock face display while shutting down Harmony

When the user holds the back button for 10 seconds to display
the "turning off" prompt, we  show a redundant clock face display.

[BH-1729] Changed the "Turn off Harmony" popup display time to 10 seconds

When the user activates the prompt to turn off Harmony, it has been
displayed for more than 3 minutes.

[BH-1733] Add Harmony version information

In the Settings->About section, we will have information
about which version of Harmony the user has.

co-author @Lefucjusz

[BH-1714] Eink refactor and error handling

Cleanup and refactor for eink code.
Changed turning on/off procedure.
Add error handling.

[BH-1726] Fix unwanted popup on shutdown screen

During the alarm occurrence and on the system turn-off screen,
selecting "No" option causes the "Next alarm will ring in 24h"
prompt to be displayed