[EGD-5999] Fix stack size for calculator

Set stack size to 2,5kB for calculator app

[EGD-5986] Fix re-enabling BT scan

Due to incorrect stopping the BT scan, re-enabling it caused
failure to HCI state machine, which was indirect cause of failing
connections. Now it works

[EGD-5832] Status bar widgets refactor

Status bar SIM widget refactor
Status bar time widget recfactor
Status bar lock widget refactor
Separation of status bar time widget and desktop main window time widget
Fixed issue with wrong calculation of timezone based time

[EGD-5984] Add BT implementation of added GUI actions

Implemented BT-side actions for GUI usage, e.g. connection status

[EGD-5758] Restore auto locking timer in ApplicationManager

Restore auto-locking functionality

[EGD-6008] Change filesystem in RAEDME.md

Changed to the new 'littlefs' filesystem.

[EGD-4410] Fix passcode change causing unlocking problem

This PR solves problem with unlocking and invalidity of password
after password change. It also refactors `SettingsAgent` implementation
to reduce unnecessary data copying.

[EGD-5995] Settings entry path parser fixed

Fixed: get value from setting when creating cache
Fixed: path parsing
Fixed: request settings value from db
Fixed: sql init script

[EGD-5906] Fix test_calendar_events

Unlock usb and enable test on CI

[EGD-5940] Add BT device unpairing

Implemented possibility to forget/unpair a device via GUI

[EGD-5880] Change mode related volume logic

Volume logic has been changed to make the
values independent from selected mode.

[EGD-5967] Add blank screen when off

Present blank screen to
inform the user that phone
is off

[EGD-5326] Fixed AT commands harness utility

We can now use test harness to send and check at commands

[EGD-5326] Fixed system messages logging crash

with messages debug utility and error on memory there  was crash

[EGD-5983] Remove volume label from music app

Removed volume label from application music player.
Volume level should be shown using new popup system.
Introduced minor fixes in music player.

[EGD-5741] Change cellular DataReceiverHandle refactor

All messages have been moved to separate handlers.

[EGD-5963] Unify type of UUID field in all endpoints

UUID is no longer stored as a string, since we are not
going to use 128b UUID.

[EGD-5059] Fix SMS thread UX issues

This PR correct following global UX issues that were noticed in SMS
threads:
- invalid Nav-bar margins (30px instead of 20px)
- invalid NAv-bar hight (54px instead of 50 px)
This PR corrects following SMS threads UX issues:
- invalid inputText's left margin (10px instead of 0px)

[EGD-5982] Fix no window refresh after pairing

Fixes no refresh after finished scan

[EGD-5981] Fix BT scan stop issue

Btstack's scan stop call was not working properly thus force stop
function has been added