Create TempControlSystem_Main

This is the main file that calls functions from 3 other *.ino tabs.
It has been tested with the oven, yay!
There is still a PID problem: it knows it has reached the setTemp, but it keeps turning the oven on.  Dr. Palmeri advised to get rid of the "windowtime" stuff from the PID relay tutorial, and make it more like the basic tutorial. That is what I will work on now.