[BH-000] Update Harmony 2.9.0 changelog

Update changelog after Harmony 2.9.0
release.

[BH-2077] Lower backlight sentinel frequency

Lowered backlight sentinel frequency from
528MHz to 66MHz, what resulted in ~50%
current consumption reduction in cases
when the device is idle with light
turned on (e.g. bedside lamp).

[BH-2073] Fix invalid accusative form in Meditation

Fix of the issue that abandoning meditation
by clicking back will result in displaying
meditation session summary with invalid
accusative form in Polish.

[BH-2064] Change message shown after removing alarm file

* Changed the message that is shown when
entering alarm sound selection list after
file selected as an alarm has been deleted
via Center.
* Fixed bug with audio exception error
code not being set at all.
* Removed unused logic handling
file limit error message, as there is no
longer fixed tracks limit.

[BH-2049] Gapless audio transition

* add minimp3 for decoding mp3 files
* add a gapless transition between the end and beginning of the track
* add a loop option to the playback mode

[BH-2056] Add bedside lamp settings

Added possibility to customize
brightness and activity time
of bedside lamp functionality.

[CP-2013] Add time sync endpoint

Added endpoint that can be used
to synchronize time via MC
protocol.

[BH-2033] Add fade in and fade out for relaxation

Relaxation sounds will fade in and out
so that the songs play smoothly.

[BH-1476] Add greetings in all languages

Random greetings after turning off the alarm will be available in all
languages.

[BH-1716] Add versioning for private assets

Private assets will be versioned from now on. By modifying the
repository content we release a new version of the assets.

[BH-000] Update Harmony 2.8.0 changelog

Updated changelog after releasing Harmony 2.8.0.

[BH-1988][BH-1990] Add What's New database and translations

* Added database with What's New entries.
* Added translations to What's New app.
* Updated image assets version to the
one containing What's New icons.
* Design fixes.
* Minor issues fixes.

[BH-2013] Add label with the name of the application on the countdown screens

Harmony's UI will be consistent so that on each screen showing the
elapsed time on a timer (Meditation, Relaxation and Focus Timer, Power
nap) will have words indicating which feature is active. This is how it
is done with the focus timer and has been added to other timers as well.

[BH-2005] Add volume setting for focus timer

The user will be able to control the volume of notifications in the
Focus Timer application

[BH-2002] Fix crash when connected with broken USB cable

Fixes of the issues that would cause device
crash when connected with broken USB cable:
* fixed memory leaks in VCOM init and deinit
functions;
* guarded accessing desktopWorker object in
message handlers, as messages are asynchronous
and might arrive after worker has already been
destroyed. Not the cleanest solution, but
does the trick

[BH-2000] Change order of entries in Settings

Changed order of entries in Settings menu, so
that they're grouped in logical categories.

[BH-1946] Add update instructions in settings

User will see instructions on how to update Harmony operating system at
any time in settings.

[BH-1776] Grinn USB fixes

Fixes and improvements implemented by external
company Grinn, expanding the set of supported
chargers.

[BH-1945] Add update instructions at the end of onboarding

User will see instructions on updating Harmony's OS at the end of
onboarding.

[BH-000] Update Harmony 2.7.0 changelog

Update changelog after Harmony 2.7.0
release.