[MOS-816] Add parse and filter IMSI

Added reading IMSI and parsing US MCC and MNC.
MCC and MNC are filterd if they are TMobile US.

[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-660] Fix disappearing button in PIN entering screen

When we returned from the SOS screen to the PIN entry screen,
the "confirm" button disappeared.

[MOS-823] Update 'misc' submodule reference

Added a possibility to use a custom GDB for crash analysis.

[MOS-811] Make SMS modem domain in line with voice

Ditto

[BH-1594] Fix information displayed during onboarding

Fix inactivity information of shortcuts.

Fix text for one of the shortcuts.

[BH-1603] New Relaxation UI

Add new UI to Relaxation application.
The user can use loop mode now.

[BH-1603] Rename BGSounds to Relaxation

Rename all files and classes. Only
filesystem paths have old name due to legacy.

[BH-1598] Add clock faces with dates

Add classic and vertical face with dates for both 12h and 24h format.

Fix centering of battery indicator when level is smaller than 100%.

Fix incorrect time format of the alarm in clock face settings.

Change placement of battery and time format indicators on
ClassicWithAmPm screen while charging.

[MOS-809] Remove dead code around celular channels

Ditto

[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.

[CP-1666] DeviceInfo request should return "SerialNumber" for Harmony

Add reading serial number from emmc partition
Add serial number to body response for deviceInfo endpoint for Harmony

[BH-1594] Add shortcuts instruction

Shortcuts instruction is a new functionality
during the Onboarding process. It shows hints
on how to use buttons.

[MOS-792] Added VoLTE setting in db

VoLTE enabled/disabled state is now stored in settings
database. VoLTE is enabled or disabled to mach setting
during modem initialisation.

[MOS-801] Fix memory handling around NetworkWindow

Added the missing window destroyer.

[BH-000] Update changelog for Harmony 1.7.0

Add missing entries.

[CP-1713] Publish OS API as MVP to our community

Publishing Protocol Description section to our community.
Publishing two endpoints: Device Info Endpoint and Contacts Endpoint.

[MOS-790] Workaround for ext4 booting

Workaround required to make MuditaOS
able to boot from ext4-formatted OS
partition.
Previously OS partition was mounted
on /sys and user partition on
/sys/user. This worked
when two separate FS drivers
(FATFS and lwext4) were used.
Changing OS partition to ext4
created an ambiguity whether
/sys/user is user partition
mountpoint or folder 'user'
on OS partition. This
workaround still may create
ambiguities, so the issue
should be fixed in one of
the further releases by
completely removing 'sys'
prefix.