[DT] ATR Trigger Bar Overlay

ATR Trigger candle is an idea that I originally heard about studying alexander elder's work at spike trade. This code is my interpretation of his work.

The idea behind an ATR trigger bar is to find areas where price is likely trapping market participants. In some cases a trigger will not form in one bar so a two bar analysis is also included in study.

Bull trap condition:
- price moves above previous bar high and in the same candle will close below previous bar close

Bear trap condition:
- price moves below previous bar low and in the same candle will close above previous bar close

TODO:

- categorize trigger bar as 1 bar or 2 bar price action
- allow user to filter 1 bar or 2 bar price action
- multiple timeframes
- volume filter
- horizontal line for average price on a trigger bar