[MOS-855] Fix weird behavior of messages

After thread was deleted, messages were still in DB
and so on

[MOS-882] Fix heap fragmentation issue during playback

Fix of the heap fragmentation issue that caused
phone crash when trying to play music files
while connecting USB cable in a certain order.
Audio stream buffering length was slightly
reduced, so that smaller contiguous block of
heap is required to store audio buffer.

[MOS-814] Fix no sound after BT reconnection

Fix of the issue that previous commit
didn't resolve - for some Bluetooth
devices voice still wasn't heard
after disconnection and reconnection
during a call.

[MOS-33] Mark thread as read when new message arrives

Now thread will be marked as read when new message
arrives when the thread is opened

[MOS-840] VoLTE switch unavailability fix

Added checking if a SIM card is present in the active slot
during ApplicationSettings initialization so that in case
there's no SIM, the VoLTE switch is made anavailable to
toggle.

[MOS-340] Fix notifications of unread SMS threads on the home screen

Conversation marked in OPTIONS as read did not disappear
from notifications about SMS threads on the main screen.

[MOS-544] MTP integration issues

* It's now possible to rename files using MTP
* Fixed issue with fs notification being sent from MTP
before file transfer is complete. This resulted in audio
tracks appearing on the MusicPlayer list while still being transferred.

[MOS-776] Deletion of outdated and invalid SettingsApi test

Deletion of outdated and invalid SettingsApi test. New test are planed.

[MOS-651] Update the unread message counter after a thread deletion

In order to delete notification of unread messages
from the thread, which was deleted.
After successful deletion of the thread
the unread messages counter is updated
as when the thread is opened.

[MOS-882] Fix FLAC file playback with USB cable connected

Fix of the issue that caused system crash when
trying to play 96kHz FLAC file with USB cable
connected. The reason of the issue was the lack
of FreeRTOS heap space left, what caused
pvPortMalloc() to fail when allocating
memory for stream buffer.

Additionally minor code cleanup.

[MOS-000] Rebase fixes

Rebase fixes

[MOS-875] Fixed rebase issues

Fixed

[MOS-872] Extended json11 supported types

Moved statvfs to stack from heap

[MOS-872] Add support for directiories in filesystem endpoint's listdir

Added support for listing directiories with nested ones

[MOS-855] Restore process update

Fixed issues with restoring from legacy backups
and cases when the database set fetched from backup package
is different than the system one.

[MOS-853] Purge multimedia database when initializing indexer

When startup indexer for FileIndexer starts, it checks for
lock file. If it's not present, it starts the indexing.

Due to changes in DB initialization we have to purge the
DB before starting the init scan because of potential
restore content

[MOS-856] Another approach to MTP path in DeviceInfo

This time it's device-agnostic from purefs paths

[MOS-855] Fix restore from legacy backup

Added checking if requested to restore backup
from pre-UDM version and setting db versions
to zero in such case, as version info file
(called backup.json in legacy backups) doesn't
contain info about versions.

[MOS-856] Update DeviceInfo documentation

Updated docs for DeviceInfo endpoint

[MOS-856] Add MTP path to DeviceInfo endpoint

Added MTP path for products to enable MC to use it instead
of hardcoded paths