Added EMC2305 4pin PWM fan driver. The driver monitors the 4pin fans sense output, it ramps up and down based on internal algorithm. The IC next to is is a temperature sensor   MAX31725MTA+T  with a 150C rating and decent precision. So there is now 5 individually controllable fan PWM outputs with RPM feedback, controlled through I2C. The MAX-31725 temperature sensor has a fast response time, which will hopefully make it a good choice for intuitive LED control based on temperature and current consumption.