ka66: Multi ATR Channels

See source code comments for details on difference.

Note di rilascio:

See source code comments for enhancements.

Changelog:

* Remove redundant calculation, leftover when refactoring.

Note di rilascio:

ChangeLog:

• Better coloring
  
• Bug fix: when zero line, should not be visible
  

Note di rilascio:

• Reduce fill transparency, from 99 to 92. Was a bit too subtle!
  
• And thanks to the convoluted fill logic to prevent colour blending (alas this convoluted logic still exists), configuring the
  style from the Style tab was not fun, too many trader-irrelevant colours.
  

Note di rilascio:

• Allow differing MA and ATR lengths, may be useful to compare volatility ranges.
  
• Allow specifying custom ATR multipliers for all 3 ATRs, instead of having just 1, 2, and 3 by default.
  
• Visuals: Remove complex fill logic, reduce opacity on fill colours. The negative is we now
  get the fills blending with each other, but with reduced opacity, not so jarring. Users are
  encouraged to either play with the colors, or simply only plot the ATR channels they are
  interested in at different points, generally keeping their charts cleaner.
  
• Visuals: Reduce line width of bands, but increase opacity so it's clearer.
  
• Visuals: Explicitly plot centre MA with circles.
  

Note di rilascio:

Simplify code further.

• Show/Hide of plotlines are now simply handled by the TradingView Style tab in Settings.
  
• Better descriptions of lines and fills for viewing in the Style tab of Settings.