Fleshed out: NT, ET, WT

Added: light array, sound array, counter i to each trainData struct.
Initialized each in main.

Purpose:  Assuming globalCount increments at 0.5s.
Array representing cycle of blinking; 1 means display, 0 means clear.
By taking globalCount%lengthLight we increment over array repetitively.

Same with sound.  Except sound we only iterate once.  Thus the counter,
to go over it once.