[CP-388] Check for duplicates before adding contact

Prevent adding duplicate contact using service desktop API.

[BH-740] Split SystemManager - part III

Move Pure-specific functionality to Pure SystemManager - part I

[BH-792] Temp format list item

Added temperature unit/scale ListItem to
the Time&Units application and integrated it
with temperature unit model.

[CP-475] Make CenterPure devs owners of service-desktop

Let CenterPure devs police service desktop to catch breaking changes
regaring CP app communications.

[BH-727] Create eink configuration for products

Customize screen resolution depending on which product is selected.
Screen resolutions for hardware boards are fixed by design.

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

[BH-799] Split DeveloperModeHelper - part I

Rename DeveloperModeHelper to DeveloperModeHelperCommon

[BH-740] Split ApplicationManager

- move `LowBattery` handling to Pure `ApplicationManager`,
- cleanup `ApplicationManagerCommon`

[BH-785] AlarmEventDBRepository

Add AlarmEventDBRepository

[BH-754] Split ServiceDB

- rename ServiceDB to ServiceDBCommon,
- create separate ServiceDB for Pure and Bell,
- move Pure-specific functionality
from `ServiceDBCommon` to Pure `ServiceDB`

[BH-779] Merge service-alarm into service-time

Merge service-alarm into service-time

[BH-774] Split event worker

Split event worker to independetly customize events for products.

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

[BH-740] Split SystemManager - part I

Rename SystemManager to SystemManagerCommon

[BH-685] Add alarm handler factory

This commit adds factory for alarm handlers with
basic handlers draft for Bell.

[BH-743] Add AlarmEvents

Add AlarmEvents to database

[BH-741] Split ApplicationManager

Separate Pure and Bell ApplicationManager functionalities
to separate files.

[BH-743] Add EventRecord implementation

Add EventRecord implementation + tests

Fix transparent backgrounds in PlantUML

Images generated using PlantUML had transparent backgrounds which made
their text difficult to read on GitHub when using "Dark Mode". Forcing
a background color of #F0F0F0 ensures they are all readable.

[BH-739] Split EventManager

Renaming:
- rename EventManager to EventManagerCommon,
- rename PureEventManager and BellEventManager
to EventManager

[BH-739] Split EventManager

Move `test-settings` to `PurePhone` product-specific directory

[BH-739] Split EventManager

Separate Pure and Bell EventManager functionalities
to separate files.