[BH-1630] Turn off the device for low voltage

The system closes only if the SoC is 0%, but
it doesn't react if the voltage has low level.
The new implementation invokes the close
procedure if the voltage is less than 3.4V.
This solution should avoid possiblity to
hang the MCU.

[BH-1624] Fix shutdown procedure

In some cases, the system wasn't able to turn off
because the GUI service got stuck. The device
was still working in the background. The cause
was an empty queue in DrawCommandQueue which
hang the GUI worker.

The interface was modified and synchronization
mechanism was removed.
The thread no longer waits in dequeue().

Also changed the worker to close in the right
way the logger worker.

[MOS-530] Various calculator app fixes

* Fixed issue with subtract operation triggering unusal behavior.
* Unified handling of the add,sub,mul,div operations.
* Updated and verified existing unit tests and added new ones covering
unhandled cases.
* Added basic requirements/readme.

[MOS-893] Fix invalid time description in the SMS thread

The sending/receiving time information will be displayed as follows:
- Only an hour –> for today
- Yesterday and hour –> for messages received/sent yesterday
- Day of the week and hour –> for messages received/sent within
last 7 days
- Date (day+month) and hour –> for messages older than week,
but still from the same year
- Date (day+month+year) and hour –> for messages
rom previous years

[MOS-196] Add days of the week to the list of SMS, calls and notes

If an event (e.g. receiving a call or SMS) happened
in the current week, we display the days of the week
instead of the date on the list.

[MOS-192] Time should not include 0 at the beginning

Fix for displaying an additional 0 at the begging of the clock.
It affects the clock in the status bar and messages and calls time.

[MOS-807] Unpacking update package

* Added unpacking and validating of
update package
* Removed 'utils-bootconfig'
* Added 'tar' module
* Minor compilation issues fixed

[MOS-783] Change boot.bin to os.bin

Change the confusing system binary name.

[MOS-783] Fixed tests and simulator for Harmony

Fixed tests and simulator for Harmony
after implementation of new filesystem
structure.

[MOS-783] Moved battery config file to '/user/data'

Moved battery config file from root
directory of user partition to
'data' directory to comply with
new directory layout design.

[MOS-783] Fixed Pure unit tests

Fixed (most of the) hardcoded
paths in Pure's unit tests.

[MOS-783] Working Pure simulator after partition changes

Fixed iosyscalls so that Pure simulator
works after directory structure changes.

[MOS-783] First part of new dir structure implementation

    Works:
    - generating .img for Pure;
    - Pure boots after flashing new image and
    seems to be working fine;

    Not yet:
    - generating update package;
    - generating image for Harmony;
    - simulator;
    - path-related unit tests fail
    due to paths being hardcoded
    in test scenarios.

[MOS-275] Fix alarm rings on the low battery screen

When we had a critical battery level and the alarm clock rang,
it was impossible to turn it off.

[CP-1512] Add crashdumps indexing

Adding indexing to crashdumps to to ensure resistance to the device date
retraction.
When max crashdump count reach the file with higher index number will be
remove.

[MOS-737] Fix for adding a country code prefix to existing contact

Adding or removing country code from existing contacts number is
changing now number record itself, exactly when changed number
is placed in DB, instead to create new number record, to avoid
miss match during matching numbers.

[MOS-641] Fix SIM cards window

Creating menus and actions depending on the SIM card
lock status.

[MOS-775] Create run-time statistics for tasks

Every hour, statistics of tasks that put a heavy load
on the CPU will be logged

[MOS-779] Fix music files extensions case sensitivity

Fix of the issue that only files with
extension in lowercase were detected
and listed in the music player's
library.
Additionally code cleanup.

[MOS-26] Add tethering info on status bar

When tethering is on, info appears in the status bar
and network coverage indicates "no connection"