[EGD-6746] Use new SimCard implementation

Switch to SimCard implementation provided by previous commit

[EGD-6728] Documentation cleanup

Cleanup acc. to guidelines created in EGD-6632.

[EGD-5661] Add power management for filesystem

Add peripheral control (USDHC and PLL2 clocks)
for file system support.
This will save energy and extend battery life.

[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-6347] Refactored phone modes handling in applications

PhoneModeObserver doesn't work properly in applications.
Applications have to handle the phone mode changes via AppMgr.
Phone mode and tethering handlers separated.

[EGD-6208] Add blocking phone mode changes during tethering

When the tethering is enabled, the phone mode shouldn't change,
now, any attempt ends with a notification

[EGD-6285] Fix system close

Add proper way of closing
system services

[EGD-6214] Add slider position reading after disabling tethering

To be able to set proper phone mode changed by the slider during
tethering, the forced readout of slider position has been added

[EGD-6209] Tethering confirmation popup added

Provided a tethering confirmation popup.
The popup shows up once a USB cable is connected to a PC.

[EGD-5834] Fix restore API

Change restore API
backup/restore/update harness tests

[EGD-6066] Removed Message default constructor

Forced each message to have declared type as parts of Bus logic
depends on it and previously we encountered undefined
behaviours. Added tests and messages validators.

[EGD-6101] Add low battery start prevention

Device will be shutdown after
startup if SOC will be below
shutdown level

[EGD-6111] Timers refactored

Deep refactor of system timers.

[EGD-5658] Add eInk CPU frequency hold

While the screen is being redrawn,
we block CPU frequency decreasing

[EGD-4853] Add Wake up GSM modem on demand

System wakes up Cellular when there is a need to communicate
with the modem, e.g. to handle an outgoing call

[EGD-5969] Add battery charging UI

Battery charging UI modified
according to design

[EGD-5918] The system should crash on init failure

ServiceDB init process times out. Its timeout should be extended.

[EGD-5304] Add new way of system close

Unified method of closing
the system orchestrated by
system manager

[EGD-5771] Create post update info window

Add post update info window.

[EGD-5756] Add Update Window

Create Update Window(s) to control and visualize the MuditaOS update
process on Pure.