[EGD-5070] Change new filesystem in module bt

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

[EGD-5070] Review changes.

[EGD-5070] Change new filesystem in module bt

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

[EGD-5061] Fix lack of audio during call

Audio might have not work if audio streams
were reused. This was fixed by introducing proper
cleaning procedures.

[EGD-4921] Add next harness test cases

Test harness extended with additional tests:
- Making a call to a specific phone number.
- Calling back to the last number from the call log.
- Searching for SMSes with a phone number filter.

[EGD-5003] Fix for 'test' spelling issue in bootstrap.sh

There was a spelling issues in bootstrap.sh

[EGD-5018] Add umount all filesystem

Add umount all mounted filesystem. This function
can be used in the cleanup vfs core stage

[EGD-4918] Change network scan for operators

Change old implementation of network scan. Now in class
which have rest of network settings as NetworkSettings.
Change method from old message style to connect/API.

[EGD-4648] Fix auto screen change

Action `UnlockSim` should be handled only if
there is ongoing SIM flow processing.

[EGD-5004] Add USB-CDC echo mechanism

Added echo mechanism to USB-CDC, update usb_stack submodule
and added a test case to test harness

[EGD-4754] Add automount default filesystems

Default automount and parse partitions according to
their configurations using new vfs core. Currently
old (without lfs) and new (with lfs) part schemes are supported

[EGD-4694] Add CPU frequency shift mechanism

The CPU frequency changes automatically which saves energy

[EGD-4828] Add GUI tests for DOM flow

 * `DepthFirstItemTree` tests - basic traverse functionalities
 * `GuiVisitor` tests - basic double dispatch calls
 * DOM serializer tests - basic serialization functionalities

[EGD-4898] Add GUI for Custom MMI messages- call forwarding

Visitor framework for displaing MMI messages.
GUI for call forwarding custom messages.

[EGD-4727] Change Torch hardware control

Change way of button usage

[EGD-4780] Change in GUI documentation to cover DOM

 * GUI Visitor documentation added
 * GUI DOM documentation added

[EGD-5036] Change new filesystem

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

[EGD-5033] Fix missing texts for ApplicationDesktop

 *Screen and Sim lock windows missing texts added

[DW-31] Add documentation link to the commit format error

Make sure that reference is easily accessible by printing the link to it
on commit message check failure.

[EGD-4502] Fix and remove old vfs boot

Remove old vfs bootconfig from the vfs which
will be removed in the later commit

[EGD-4757] Add unit test for new filesystem

Due to vfs deprecation new filesystem needs
unit tests to verify it's behaviour.This PR
covers core filesystem operations.

[EGD-4927] Change new filesystem

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