[MOS-803] Add backup/restore scripts

* Added test directory layout
* Added test assets
* Added backup/restore scripts

[MOS-835] Per product layout of database migration scripts

Implemented DB init migration and version.json update

[MOS-783] Fix crash on entering SAR menu

Fix of the issue that entering SAR option
in menu resulted in crash of the phone
due to uncaught exception caused by
invalid path provided.

[MOS-798] Bump Ecoboot version for Harmony

Change Ecoboot asset version to the newest one,
supporting A/B booting.

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

Change the confusing system binary name.

[MOS-000] Rebase fixes

Fixes for master -> UDM rebase

[MOS-785] Reworked updater dependencies into recovery

Fixed usage of updater in OS build flow to use recovery

[MOS-783] Fixed tests and simulator for Harmony

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

[MOS-786] Add to docker required libraries

Added required libraries for building docs for recovery

[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] Fix not adding development assets

Small fix for development assets
Fix for jenkins build - changed SSH to HTTPS clone
for pure-core

[MOS-783] Fixed issues with generating imgs

Fixed:
- improper block count in Harmony,
resulting in ~300MB unallocated space;
- invalid rsync parameters, resulting
in nested 'factory' directory structure
creation;
- minor fixes.

[MOS-786] A/B Booting - fixed factory reset from menu

Now factory reset works both from ecoboot and from menu

[MOS-783] Fixed generating image for Harmony

Needed because of layout change

[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-786] Added support for A/B boot codes in OS

Further implementation of A/B booting

[MOS-786] Added A/B booting support in OS

Added basic support for A/B booting

[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-806] Prepare scripts dependencies

* Added scripts dependencies
* Added script to generate scripts package
automatically
* Added integration with PureOS CMake
* [MOS-804] Created factory reset script