[EGD-5098] Fix and remove old vfs class

Fix and remove global vfs object remove all old data
included in the vfs.hpp class

[EGD-5097] Fix minor issues with littlefs fuse

Fix minor issues with littlefs implementation

[EGD-5097] Fix open flag translate

Fix open translation flags in the littlefs fuse

[EGD-5088] Change new filesystem implementation

Removed deprecated vfs calls from all applications.

[EGD-5074] Add native fscore for emulator

This is a first commit when the emulator uses
the new filesystem core.

libiosyscall library read environment variable

IOSYSCALS_REDIRECT_TO_IMAGE

When  IOSYSCALS_REDIRECT_TO_IMAGE=1 all syscalls
are redirected to the image. If env is not defined
or set to 0 only paths are translated and redirected
to the native linux syscalls

[EGD-5074] Remove free rtox library

Remove unneeded fat library from the freertos

[EGD-5074] Fix freertos mutex as unique

Add freertos mutex in the unique_ptr for avoid inclusion of the
freertos.h

[EGD-5074] Remove frertos-fat submodule

Remove uneeded fat freertos submodule

[EGD-5074] Add handle types in the vfs_subsystem

Add handle types in the vfs subsystem

[EGD-5074] Add submodule for hashmap

Add submodule for hashmap

[EGD-5074] Add support for dirent

Add support for dirent for new filesystem

[EGD-5074] Fix mutex class

Remove mutex in header

[EGD-5074] Remove old vfs from file indexer

File indexer should be fixed for use new vfs

[EGD-5074] Fix unit test vfs

Remove unit tests vfs for clas

[EGD-5074] Add Posix implementation with new fs

Add posix implementation with new fs core

[EGD-5074] Fix stdio syscalls

Fix all stdio syscalls

[EGD-5074] Fix iosyscalls scan family

Fix iosyscalls scan family

[EGD-5074] Fix native API

Fix native api

Work in progress some minor fixes

[EGD-5074] Fix lib stdio

Fix lib stdio

[EGD-5074] fix lseek return value in fat driver

Fix lseek return value in the fat driver

[EGD-5074]  Unit test fix

Unittest fixes

[EGD-5074] Emulator syscalls

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>

changelog: fix broken changelog for v0.49.1

Merge branch 'stable'

[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

changelog: update changelog for v0.52.1

[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.