All statistics up and running, few bugs

Bugs:
-Welcome splash screen does not update itself after a game is won.
-When a game is won, dialog confirm window opens twice.
-Could not implement player completion rate, since numStarts will always
be equal to numFinishes. Changed to numFinishes instead.
-If save .txt file is missing, have to run once to generate .txt,
however an exception occurs. After initial run (and fail), program works
normally.