main "driver" of project. Uses all classes to store and organize information.

Reads in a file (if it exists) to restore previous saved information. Asks user to add/remove courses, scores; asks user to set percentages if course is weighted. Default courses are unweighted. Saves info when properly exited.

ClearScreen() is a function found online. It simply clears the console screen to give more readability without calling system("clear") since we all know that's a big NO NO. Because of this function this can only be used in Windows. I'm still currently looking for a way to clear the screen in linux/mac