[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-791] Introduce tri-state switch widget

Refactored the code so that it's prepared for the new logic.

[BH-1557] Change Harmony home screen font to bigger one

Fix AM/PM font on one of the home screens, change it to normal size/

Fix type of FontInfo members representing spacings, chane them to signed
integers.

[BH-1601] Fix back button behavior in Relaxation

If the user clicks the back button in the pause
state the user will be switched to the menu with songs.

[BH-1574][BH-1597] Improvement of bedside lamp

Improve bedside lamp behavior in alarm
application. Change frontlight long press
from 3 seconds to 2 in order to activate
bedside lamp.

[MOS-770] Replace VoLTE state switching mechanism

Updated the documentation.

[MOS-770] Replace VoLTE state switching mechanism

Added unit tests.

[MOS-770] Replace VoLTE state switching mechanism

Introduced the new implementation.

[MOS-770] Replace VoLTE state switching mechanism

Thrown out the previous implementation.

[MOS-788] Fix incorrect total CPU usage in logs

After a long time, a counter overflow appeared

[MOS-744] Fix MTP integration

Fixed issues with integration
of MTP with filesystem:
- fixed memory corruption in
get_disk_properties();
- removed spare space hack
causing MTP to return invalid
free space and capacity of
the storage;
- added mtime and ctime
handling;
- minor code cleanup.

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

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

[BH-1574] Add bedside lamp feature

To activate the bedside lamp the user needs to hold
the frontlight button for approximately 3 seconds.
The bedside lamp turns off after 10 minutes or
after pressing frontlight button.

[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.

[BH-1592] Prevent saving meditation settings when going back

- When options are changed do not save the data right away.
- Move loading data from onBeforeShow to keep options after popup.
- Fix the back/close logic to avoid saving volume when back is long
  pressed.

[BH-000] Disable refresh cancel log

Put it behind #ifdef like the rest of eink refresh logs.

[BH-000] Add disk img building tasks for Harmony

For Linux and RT1051. These tasks are also executed at the end of
Configure and Build tasks.

[MOS-26] Add tethering info on status bar

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

[BH-1590] Light press ends the Power Nap

The deep press doesn't have any effect on the power nap application.
At the end of the power nap, the deep press change only alarm mode.

[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.