[EGD-8002] Added SSP, fixed some minor issues, removed obsolete code

ssp seems working
minor crash fixups
copy lacks patched
obsolete code removed
Devicei tests added for added code and cleanup
Added missing tests for new functions
Code cleaned up a bit - mostly moved to cpp

[EGD-8083] Add wallpaper option

Added connection of wallpaper window to settings

Merge remote-tracking branch 'origin/stable'

[EGD-7922] Added InputEvents Debug option

Added Debug flag for InputEvents in EvtManager and Application.

[EGD-7922] Added Permanent Frequency Setting

Added Permanent Frequency setting in Advanced Developer
Mode with simple set window.

[EGD-7909] Fix Retry mode change on fail

Service cellular will retry phone mode change on
failed attempt.

[BH-1125] Add file indexer

Add file indexer

[BH-1277] Fix critical battery flow

Removed handling of critical battery level from bell's
home screen. From now on, battery SOC can drop to 1%
(battery notification will change from showing 1 bar to
crossed battery symbol upon reaching <5% SOC). If it drops
any further system shutdown procedure is invoked which results
in the device being turned off.

Merge remote-tracking branch 'origin/stable'

[BH-1282] Fix bell power on when usb connected

attached dome switch as power (reboot) key when usb connected

[BH-1191] Alarm priorities

Enhanced alarm priorities handling

[BH-1259] Snooze time displayed incorrectly
while returning to the home screen

[BH-1263] Bottom message displayed when
editing alarm

Fixed ambiguous iterator use.

[EGD-7864] Fix Modem rf in enabled after sim selected

Modem is now disconected from network until active sim card
is selected.

Merge remote-tracking branch 'origin/stable'

[EGD-7900] Fix backlight behavior

Cumulated fixes for both screen and keypad light

[EGD-7960] Fix of concurrent alarms handling

fixed the processing of alarms set to the same time
also taking into account concurrent snoozes

[EGD-7874] Fix no disconnect after unpair

When user tried to unpair connected device, the device was not
disconnecting. Now it's fixed

Merge remote-tracking branch 'origin/stable'

[BH-1191] Alarm operations priorities

Implemented a very basic alarm operations priority.

[BH-1204] Fixed time format being incorrectly displayed
in background sounds app.

[EGD-7909] Fixed phone mode switching

Service cellular is holding minimum cpu frequency during
phone mode switch.

[BH-1030] Frontlight ramp

Frontlight ramp