gpio: Fix indentation.
build: Add basic support for RuuviTracker C2
TinyNMEA: Add new NMEA parser.
uart: Add initialisation for UART 3.
sc: Add some libc stubs.
SDU: Add force redetect option.
sdu/uart: Use const parameters, when appropriate.
log: Add printf style logging functionality.
event: Increase thread stack size to 2048 bytes.
slre: Add regular expression library.
GSM: Add driver for Simcom 908/968.

Update RuuviTracker configs and the Tracker application to use the
GSM driver.
uart: Add #ifdef guards in initialisation.
sc.c: Fix compiler warning.
sc: Rename SC_INIT_* to SC_MODULE_*.
gsm: Remove dependency to slre.

Add #ifdef guards for gsm code.
all: Add deinitialisations.
Power: Rewrite.
nmea: Fix compiler warnings.
log: Fix compiler warnings.
event: Add GSM event.