[SPI] Changed uint16_t functions name and removed SPISignalGenerator

CMakeLists.txt

cmake/boardcore.cmake

src/shared/drivers/spi/SPI.h

src/shared/drivers/spi/SPIBus.h

src/shared/drivers/spi/SPIBusInterface.h

src/shared/drivers/spi/SPIDriver.h

src/shared/drivers/spi/SPISignalGenerator.h

src/shared/drivers/spi/SPISlaveBus.h

src/shared/drivers/spi/SPITransaction.cpp

src/shared/drivers/spi/SPITransaction.h

src/shared/sensors/MAX31855/MAX31855.cpp

src/tests/drivers/spi/test-spi-as-slave.cpp

src/tests/drivers/spi/test-spi-signal-generator.cpp

src/tests/drivers/spi/test-spi-slave-bus.cpp

src/tests/drivers/spi/test-spi.cpp