Added DW1000 demo app on top of NUCLEO_F103RB example
set the C standard to C17 (ISO), although this does not make any difference according to GCC documentation
Introduced the CORTEX_ENABLE_WFI_IDLE flag in all chconf.h files, so the MCUs will enter sleep mode whenever the system is idle.
Enhanced and fixed several module specific files.
Changed all header guards so they will not use unserscores as pre- and postfix.
Introduced support the STM32F103 NUCLEO module.