pios_semaphore: added implementation using ChibiOS BinarySemaphore
pios_com: use pios_semaphore
pios_ms5611: use pios_semaphore
pios_ms5611_spi: use pios_semaphore
flight/uavtalk: use pios_semaphore
pios_mutex: added
all fw makefiles: added pios_mutex.c
alarms: use pios_mutex
eventdispatcher: use pios_recursive_mutex
uavobjectmanager: use pios_recursive_mutex
uavtalk: use pios_recursive_mutex