Core: Forgot to update utils.hpp coding style.
Periheral: SPI: Adapt Software SimpleSpi to new interface.
Peripheral: Fix avr core xml.
Peripheral: Add BufferOptions to Spi.
Peripheral: Update Gpio, I2c, Uart to new coding style.
Peripheral: Simplify SimpleSpi.
Peripheral: Formatting of AVR Gpio.
Peripheral: GPIO: Add new template GpioPort implementation.