[EGD-7770] Fix atomic stability

Add global __GTHREADS definition to trick standard library into thinking
we have a proper threading support and that it should not used single
threaded locking policies. As a result shared pointers will use atomic
locking policy to synchronize access to reference counter.

Add own version of gthr.h to override __gthread_active_p.

Add cxa guard and release for globs.

Looks like there was conflict when __GTHREADS was set so own version of
atomicity.h is removed.

Co-authored-by: Alek Rudnik <aleksander.rudnik@mudita.com>
Co-authored-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>
Tested-by: Alek Rudnik <aleksander.rudnik@mudita.com>
Tested-by: Tomasz Krosnowski <tomasz.krosnowski@mudita.com>
Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>

[EGD-7799] Enable SSP authorised pairing

This enables Simple Secure Pairing which is required to pair
from another device (device -> Pure). As for now, only KeyboardOnly
capabilities are enabled as we have all frontend and backend
already enabled for entering the pin code/passkey

[BH-990] Adjist CPU frequency chages

Adjusted Bell frequency low-power mode changes

[BH-943] Usb stack version update

Fix usb stack version downgrade

[EGD-7777] File indexer - limited supprted files

File indexer supported files are now limited to wav, mp3, flac.

[BH-943] Fix screen clean after exit

Remove cleaning screan after shutdown.

[BH-1013] Add missing alarm time on homescreen

Add missing alarm time on homescreen after alarm ringing

[BH-1039] Fixed frontlight fallback to default value

The frontlight should not fallback to its default value
once the ramp target is reached.

[EGD-7339] Correct preparation time unit

60s was displayed instead of 1m.

[EGD-7796] Fix display of central button in meditation options

SWITCH button was displayed instead of SELECT.

[EGD-7793] Remove 15 and 30m from meditation preparation time list

Such long preparation time is not needed - removed.

[EGD-7797] Change the way the text is displayed in Meditation app

Line break was placed incorrectly.

[EGD-7790] Change font for interval chime component

Adjust font size according to designs.

[EGD-7232] Music player track preview

Added track progress bar and track preview window.

[BH-916] Bell factory reset

Rewritten advanced options code. Thanks Mati !

[BH-1003] Fix snooze settings UI

Add snooze chime interval bottom description

[BH-1018] Fix Bell BGSound Stack Smash

Increased application stack

[EGD-7794] Show meditation timer by default

Show meditation timer counter is now ON by
default in meditation app options.

[BH-932] Hide arrows on NumListItem border values

Hide arrows on NumListItem border values

[BH-618] Power nap fixes

Implemented various fixes:
BH-995
BH-996
BH-997
BH-998
Fixed PlayActions
and more.