Moved static gps structure to gps.c
Implemented handling of incoming SMS and incoming Call
Merge branch 'master' of https://github.com/thauta/ruuvitracker_fw into gps

Conflicts:
	src/platform/stm32f4/gps.h
Added gps.is_receiving() to report on Lua
generate_tags.sh: Fixed wrong cscope flag
Add more debug printing to error situations.