[MOS-178] Add input mode displaying timeout

Added timeout for displaying selected input
mode - now it automatically disappears
after 3 seconds since last change was made.

[MOS-906] Fix missing tick mark in ringtones list

Fix of the missing tick mark that should appear
on the currently selected ringtone, but didn't.

[MOS-28] Change alarm sounds and ringtones preview behavior

Change of the behavior of alarm sounds
and ringtones preview, so that it matches
with the design.

Additionally fixed lack of ringtones list
looping.

[CP-1210] Contacts imported from SIM dont show up in Mudita Center

Fix for imported contacts from SIM don't show up in Mudita Center.
Added functionality to send notification after all imported contacts are
added to the database.

[CP-1734] Create factory reset reboot UI

Create window that will be shown when the
device turns off first time after factory
reset request made from PureOS.

[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-783] Working Pure simulator after partition changes

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

[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-373] Fixed missing timezone window

Fixed missing timezone window, which should be displayed
after Automatic date and time setting is set to disabled.
MOS-181 is also fixed by this commit.

[MOS-836] Fix for selecting SIM during onboarding

After inserting the SIM tray at the onboarding stage
before selecting the slot - it is not possible to select
the slot and activate the desired SIM card if it does not
have a PIN enabled.

[MOS-825] VoLTE steering according to IMSI

Steering the GUI and the modem according to
whether VoLTE is permitted for the active
SIM card's operator. This is done based on
the SIM card's IMSI string.

Additionally, made logging more consistent.

[MOS-821] Adjust VoLTE GUI basing on operator

When VoLTE isn't permitted for the current SIM
card's operator, display information only.
Otherwise, display a switch.

[MOS-800] Add a popup for changing the SIM card

Sometimes the process of changing the SIM card
takes a few seconds and the user needs to be informed
that something is going on in the background.

[MOS-793] Connect GUI and modem VoLTE steering

Additionally, fixed many covert bugs that emerged due to
modem restarting.

[MOS-641] Fix SIM cards window

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

[MOS-801] Fix memory handling around NetworkWindow

Added the missing window destroyer.

[MOS-791] Introduce tri-state switch widget

Introduced the new logic.

From now on, every button can be tri-state, that is,
OFF/ON/Transiting whereas the Transiting state is
marked with the 'cheking...' caption written on the
button.

[MOS-770] Replace VoLTE state switching mechanism

Thrown out the previous implementation.

[MOS-350] Restored notifications about PIN changes

Made SimInfo pop-ups completely omitted when
going back to windows.

Fixed the SimUnlockInputRequestParams's
constructor.

Done a bit of refactor in the places of
interest, e.g. naming clarification.