[MOS-000] Update changelog

Update release date

[CP-1453] Update test script for file system endpoint

Add test for listing files and their size in a specified path.

[MOS-638] Fix poor phone responsiveness

Sometimes it took a long time to redraw
the screen with the USB cable unplugged.

[CP-1454] Add file size to the list of files in specified path

Next to each of the files listed in the file list in the path
specified in the request is now displayed its size.

[MOS-000] Update README

Updated changelog entry in readme

[MOS-000] Add changelog

Added changelog

[BH-1537] Statistic frontend

Added integration of statistics model,
presenter and widget.

[BH-1538] Stats info widget

Created statistics info widget.

[MOS-645] Fix Mudita Center synchronization fail

Sometimes the user was unable to connect
to the Mudita Center due to sync errors

[MOS-421] Add state refresh when BT automatically turns off

Added code to update BT power state
when it automatically turns off due
to inactivity.

[MOS-598] Improved keyboard responsiveness

Add sentinel that increases and hold the CPU frequency
after a button press event

[MOS-499] Improve lock screen power consumption

Power on the e-ink only when it is needed e.g. fast or deep
refresh. Update battery percentage only when discharging.

[MOS-635] Bump updater version for Pure

Changed downloaded version of updater,
1.5.2 allows to downgrade MuditaOS.

[MOS-601] Disable debug timer in DisplayLightWindow

The timer is responsible for refreshing debug options which interferes
with navigation strings of other windows until it is stopped when window
is destroyed.

[MOS-421] Fix BT state first rendering off

Fix of the issue that after entering
bluetooth settings power state is shown
as off at first, even though bluetooth
is turned on.

[MOS-573] RT1051 and linux documentation

Created readme about files in directories. Also added
documentation on how to add or update syscalls wrappers.

[BH-1356] Meditation stats backend

Added meditation statc backend.
Added temporary widget for testing
purposes and corresponding modules
(meditation stats presenter, window,model).

[BH-1515] Bedtime reminder notification issue

fixed formatting issues

[BH-1515] Bedtime reminder notification issue

AbstractAlarmAction execute method takes Record as paremeter to pass it
to action
Bedtime abstraction extended to keep own EvetContainer and hadle needed
actions(push,clear ... and so on)

Fixed an issue where cpp file was added by #include directive
New fuction added to test/CMakeLists.txt to
add manually prepared target to test siute
googletest-service-time-alarm-operations source moved to library and
than linked in to googletest-service-time-bell-alarm-operations

[CP-563] Return correct threadID after adding new message

After adding new message via Messages EP API,
threadID field was always 0, which was incorrect.