Educational: lines, linefill, labels & boxes

This educational script contains different examples regarding lines, linefill, labels & boxes

First part shows the use of array.new<linefill>() without first
retrieving line.new() which then are put in a linefill.new()

At every start of the week a linefill.new() is added with the top line being
previous Weekly high, and the bottom line being previous Weekly low,
if close doesn't go above top line, or below bottom line, both lines will be made longer
with 1 bar_index (line.set_x2), otherwise the lines stop, and change color

Please read the comments in the script as well

Cheers!