[EGD-4927] Change new filesystem

Due to vfs deprecation there is need to remove all vfs calls from code. This PR covers module apps.

[EGD-4788] Add custom repeat window for the alarm application

When choosing alarm repeat option now it is
possible to choose specific days of the week
and their combinations.

[EGD-4992] Add main Security screen

This commit implement only main Security screen.
Change passcode functionality will be implemented
in [EGD-4995].

[EGD-4978] Add Bluetooth virtual audio device

Bluetooth audio device requires different handling than other
audio devices. The commit adds proxy device that does not
handle requests itself but instead sends requests too Bluetooth
service.

[EGD-5035] Fix error translation fs

Quickfix for error translation issue in new filesystem.

[EGD-4869] Add bluetooth message status to application settings

This change demonstrates how to work with Bluetooth messages
in application settings windows.
Responses to bluetooth status messages are mocked because
settings storage and message handlers in Service Bluetooth
are not ready yet.

[EGD-5010] Fix Text tests leaks

Fixed leaks in gui Text tests.

[EGD-4579] Add bluetooth settings storage

Add settings storage to bluetooth related items

[EGD-4952] Changelog update

[EGD-4952] Branch fix applied

[EGD-4952] Reverted usage of settings

[EDG-4952] Default value if does not exist in DB.

[EGD-4952] Added stetings for battery critical level

[EGD-4952] Cleanup

[EGD-4952] Moved battery level check to separate module

[EGD-4952] Fixes for rt1051

[EGD-4952] Added battery check at init and if crit level changed

[EGD-4952] Added critical level check + messages

Merge branch 'stable'

update changelog for v0.51.1