* formatting of ServiceCellular::DataReceivedHandler
* [fix] - check if channel is not nullptr
* Minor enhancments and safety checks
* minor clean up
* sprintf removal
* references
* fix for not switching to active call
* Added missing icons during unaswered outgoing call + some error logging
* Added additional logging to AT commands
defult timeout set to 300 ms.
Set different timeouts per each AT command.
Minor code refactoring.
* Added some logging, fixed some timeouts and number of returned tockens.
* commented out not needed log
* Added LOG_CUSTOM logging support. Remove unnecessary LOG_ERRORS.
* set ATA cmd timeout to 90 sec
* PR fixes
