- QIND URC has been extended to support FOTA reply
- added support for CLIP, CMTI and POWERED DOWN URCs
- added support for URC responses codes handling
- created URCHandler abstraction and moved out URC handling from
cellular service code
- URC objects are now created by factory on a basis of URC head, rather
than previous approach where they were created a priori
- Renamed classes to be consistent with rest of the project