i-HighLow 2018-11-20

i-HighLow indicator draws the channel with borders correspond to highest high and lowest low values of the bar's shadows for the last N bars.
Indicators' parameters are:

• extern int N = 20; - searching of highest/lowest bars for the last 20 bars
• extern int N2 = 5; - drawing the borders with 5 points offset by price axis