[EGD-5615] Fix message not sent warning

Because of to short operation timeout, messages was
marked as not sent despite being received properly.

[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-5527] Fix APN GUI functions: add/edit/delete

redefine functions: saveAPN, renameAPN
add activeApn field to hold selected APN
refresh Apn list after add/edit/delete

[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-4861] Call waiting response parser

It allows to show proper GUI windows for call waiting MMI responses.

[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-4862] Add CLIP, CLIR etc responses parser

It allows to show proper GUI windows for CLIP,
 CLIR and IMEI MMI response

[EGD-5387] Volte settings change problem solved

Volte settings made global. Merge issue regarding screen lock resolved

[EGD-4860] Add call barring response parser

It allows to show proper GUI windows for call barring MMI responses.

[EGD-4859] Add call forwarding parser

It allows to show proper GUI windows for call forwarding MMI responses.

Merge branch 'master' into stable

[EGD-5325] Remove using namespace directives from headers

"Using namespace" directive should not be added in headers
because this practice pollutes source files.

[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