* Re-arranging VCP files in preparation for AT32
* Tab size 4
* Adding ADC driver for AT32F43x
* RCC code here is STM32 specific.
* Adding rcc.c for AT32
* pwm_output.c has very specific MCU coupling - to be re factored.
* Separating exti.c
* Split up io.c int stm32/io_stm32.c and at32/io_at32.c
* Adding in VCP files for AT32 and move timer
- note will require more cleanup
* Solving for sanity checks
* Inadvertent inclusion of timer.c for HAL
* rcc.c, timer.c and moving other spevific files out of the driver directory
* Adding I2C drivers
* Formatting
* ws2811 driver and usb_msc driver skeleton
