Update Base Roulant to handle negative speed command from CAN

[trietngh]

• Base Roulant can now handle negative speed send by Raspberry Speed > 0 : Clock-wise Speed < 0 : Counter clock-wise
• Regulation loop is active, to deactivate, comment the BR_regulateSpeed() in HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) --> line 344, file base_roulant.c