ChibiOS: fix GPIOv2 conflict with st libs GPIO_TypeDef
pios_semaphore: add ChibiOS implementation
pios_mutex: add ChibiOS implementation
pios_thread: add ChibiOS implementation
pios_com: add support for ChibiOS
pios/common: add support for ChibiOS
GenericI2CSensor/i2c_vm: add support for ChibiOS
pios/stm32f4xx: add support for ChibiOS
pios/stm32f4xx: add makefile and linker script for ChibiOS support
pios/common: add pios_freertos_transition
pios/stm32f4xx: add pios_freertos_transition_priv.h
pios/stm32f30x: add support for ChibiOS
ChibiOS: disable stm32f30x usb irq relocation for legacy compatibility
pios_mpu6000: use worker thread
pios_l3gd20: use worker thread
fw_flyingf3: switch to ChibiOS
fw_quanton: switch to ChibiOS
fw_sparky: switch to ChibiOS
fw_revomini: switch to ChibiOS