Support for aggregating temperature sensors

[justin13888]

Just tried configuring the app but wasn't able to find a way to control fan based on multiple temperature sensors (e.g. use the average, max).

If it isn't impossible currently, I would be interested in making a PR!

[justin13888]

Additionally, would want to be able to have a fan be dependent on the other fan speeds rather than temperature sensors (e.g. my rear case fan is used to balance the internal pressure of my case from my exhausting AIO and intaking front case fans)