[EGD-5322] Add send message test (long sms, special characters)

Add send message test (long sms, special characters)

[EGD-5322] Add send message test (long sms, special characters)

Add send message test (long sms, special characters)

[EGD-5158] Change access to the bus methods

The bus is now accessible only via Service object.

[EGD-5045] Change call flow handling for lock screen

Call requests on lock screen have to be handled
separately to allow only emergency and ICE numbers.

[EGD-5451] Added SMS Center SMSC check to OS

Extended cmd mechanism to provide class defined responses and
implemented SMS center verification to check if SIM card is properly
cofigured and is able to send SMS messagess at all.
This check is needed because if SMS Center is lost we are not able
to send SMS messages with no verbose error codes.
Added milliseconds and noexcept specifiers for at commands
Fixed Chanel name to Channel

[EGD-5132] Change time synchronization logic

Until now first network time update has been disabling
periodic time update. Now the time is updated periodically.

[EGD-5273] Add possibility of add new and delete APN

Functionality based on existing functions for APN.
additionally, context number management
(base on Quectel correspondence)
and saving APN to settings has been added.

[EGD-5387] Volte settings change problem solved

Volte settings made global. Merge issue regarding screen lock resolved

Merge branch 'master' into stable

[EGD-4960] registerVariableChange moved to Init section of apps

[EGD-4960] Settings Interface added parameter do distinguish global/app settings
[EGD-4960] global/local setting determined by enum value, unregister all variables in one call, ut updated
[EGD-4960] SettingsScope usage in SettingsMessages

[EGD-4740] Add New/Edit APN window - Part1

Add New/Edit APN window - basic window/ model/ widget

Merge branch 'master' into stable

[EGD-4429] Fix gui issues in application call

Fix the persistent answer and reject labels in Call Window issue
Fix the wrong call duration issue in both Call and Calls apps
Fix the not working call ignoring issue

Merge commit 'c7dd6b399' into stable

Merge branch 'master' into stable

[EGD-2501] Add gsm powerdown due to battery

Gsm model power state maintenance based on battery level.

[EGD-4338] Fix menu notification dot

Each tile in Menu that uses notification dot
is be refreshed. It also solves missing dot
issue of EGD-4129 and lack of sound notification
on incoming text message.

[EGD-5166] Add query-callback synchronization mechanism

Receiver object cancels the callbacks at the end of its lifecycle.

[EGD-4737] Add VoLTE ON/OFF switch in Settings Network window

Add VoLTE ON/OFF switch in Settings Network window

[EGD-4920] Add API to get current operator name

Asynchronous API to get operator name,
also possibility to easy extend solution for
current operator technology and information about
operator selection mode (automatic/hand).