Update TempControlSystem_SetTemp

Edited the userAdjustTemp and setDesiredTemp methods so that they no longer rely on global variable setTemp. userAdjustTemp is now called userAdjust, since you can use it for both temps and times. Made a new method called setDesiredTime.

(+) userAdjust now inputs, adjusts, and then outputs a double called thingToAdjust. This can be a time or a temp.
(+) setDesiredTemp now makes a double called tempToSet, makes the user set that temp, and then outputs tempToSet.
(+) setDesiredTime is a new method makes a double called timeToSet, makes the user set that temp, and then outputs timeToSet.
(+) display_Instructions() now needs to be called from the main.
(+) From the main, setDesiredTemp and setDesiredTime should be called like this:
desiredTemp1 = setDesiredTemp();
desiredTime1 = setDesiredTime();
desiredTemp2 = setDesiredTemp();
desiredTime2 = setDesiredTime();
desiredTemp3 = setDesiredTemp();
desiredTime2 = setDesiredTime();