pios stm32f4xx: added ChibiOS IRQ prologue and epilogue macros
pios/stm32f30x: add support for ChibiOS
pios.h: add chibios header for now to prevent redefinition of chip
ChibiOS: disable stm32f30x usb irq relocation for legacy compatibility
all flight: use pios_heap
pios_mpu6000: use worker thread
pios_l3gd20: use worker thread
osx pios_heap: added stub for PIOS_heap_get_free_size
posix pios_heap: added stub for PIOS_heap_get_free_size
tests/logfs: use pios_heap
taskmonitor: add support for ChibiOS
fw_quanton: switch to ChibiOS
fw_flyingf3: switch to ChibiOS