Max - min - ML - top/bottom GP

This script keeps track of historical max's and min's and calculates the midline and top/bottom GP fibs off that.

The way it calculates max/mins is unique as it's a two-step customizable process. In settings, there are two adjustable parameters; length and lookback.
The length parameter defines how many candles the max/min will be saved for. If the last recorded max/min happened longer than the length variable it will reset.
The lookback parameter comes into play when a max/min is reset. It simply looks back x candles and gets the new max/min from that