[EGD-6506] Turn on function keys backlight during call

Backlight of function keys are on when call is active.
When call ends, previous backlight mode is restored.

[EGD-6452] Sound selection GUI

Sound selection GUI used to change ringtone, message sound and
notification sound in settings.

[EGD-6301] Add Connecting to the network in intervals

It implements mode Offline Messages only - connecting to
the GSM network in defined by user intervals and rejecting
incomig calls during connected phase. It also implements
handling of connetion interval setiing and small fix in modes
popup.

[EGD-5773] Device becomes not responsive when opening settings

Use asynchronous communication with service cellular
to obtain own number.

[EGD-6527] Internationalization API unification

Single api to rule i18n
all calls to localistaion in cpp files unified
cut off ass many dependencies in i18n header as possible

[EGD-6485] Remove Cellular message types from global

Domain-specific message types should not pollute global space.

[EGD-6313] Fix Display backlight settings are not presistent

Add global scope to settings db function calls

[EGD-6431] Add battery charging temperature ranges

Added actions of several cell temperature
ranges according to requirements.

[EGD-6571] Fix error message

`std::filesystem::remove_all` function returns
number of files and directions removed.
Return value in `cleanupAfterUpdate` from this function
wasn't properly interpreted and returns an error even if shouldn't.

[EGD-6166] HSP ringing

Added HSP ring sound on incoming call event while
there's bluetooth connection active and HSP is
selected as the current profile.
Possibility of pick up/decline the call using
BT device buttons added.
Slightly changed HSP initialization according
to the UML-s added.
Changed call hangup handler in service cellular.

[EGD-6575] Rename Unicast with timeout as UnicastSync

Using Unicast with timeout is dangerous and strongly discouraged.
This change allows for more precise tracking of such cases.

[EGD-6573] Fix default audio paths

Default audio paths updated to the newest ones.

[EGD-6093] Audio settings API

Refactored Audio settings API.
Moved phone modes logic from serivce audio to service clients level.
Removed redundant API.
Seprated API for vibration and sound enable/disable.
Fixed issues with vibrations logic.

[EGD-6553] ServiceGUI stack depth extended

ServiceGUI stack depth extended from 1024 to 1536 words.

[EGD-6529] Fixed issues with gray colors

The issue occurred on multiple refreshes in the short period of time.
Sometimes, fast refresh was performed instead of the cached deep one.

[EGD-6515] Answer/reject calls using headset

Clean up propagation of headset keys events
Clean up volume control with headset keys
Update key mappings for simulator
Use headset OK key to answer/reject calls

[EGD-6505] Implement “On when active” Keypad light functionality

Implement “On when active” Keypad light functionality

[EGD-5360] Add USB current selection

Charging current selection algorithm
depending on USB type.

[EGD-6486] Fix for settings not avaialble at phone startup

Fixed the comparison function of EntryPath objects.

[EGD-6507] Enable per-module testing

Add per-module:
 - test build
 - test execution
 - coverage reporting (xml/html).

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>